Friday

December 19, 2014

December 19, 2014

Number of results: 6,179

**linear algebra**

if: A and B are matrices and A^2 is similar to B^2 Is A guaranteed to be similar to B? ------- Matrix similarity means that the matrices are identical if one of the matrices is converted to another basis. If matrices C and D are similar: C = P^-1 * D * P where P converts from ...
*July 20, 2007 by mathstudent*

**matrices**

Two matrices can be multiplied only if their sizes are compatible. Suppose that U is an m × n matrix, and that V is a p × q matrix. In order for U•V to make sense, what must be true of the dimensions of these matrices? Although matrix multiplication uses dot products, it is ...
*April 13, 2010 by Yadlay*

**maths**

x and y are two matrices x= {-2 0} and y {4 -1} {5 1} {3 7} evaluate x^2+y is the ans={8 -1} {18 8}
*May 23, 2008 by chantel*

**Matrices (math)**

0.433= (45.6*A) + (3.152*B) 0.3363= (11.92*A) + (37.675*B) Solve for A and B using matrices
*May 2, 2013 by Jess*

**maths**

solve the following simultaneous equations using matrices 3x-6y=24 and -4x+5y=-23
*January 2, 2008 by cecelia*

**Maths**

Let A,B and C be matrices such that A=(1 2 3 1 2 3) , B=(1 2 2 4 2 3) and C=AB. What is the sum of all the elements (entries) of matrix C?
*April 16, 2013 by OIan*

**Urgent please help! matrices**

solve using matrices x+3y-3z=12 3x-y+4z=0 -x+2y-z=1
*December 7, 2011 by Anonymous*

**Math: matrices**

If A and B are both square n x n matrices, If AB = I, prove BA = I Presumably you have to do this without using the usual properties of the inverse of matrices. But we do need to use that if there exists a matrix B such that A B = I then the equation A X = 0 has the unique ...
*December 4, 2006 by mathstudent*

**maths (matrices)**

Find the value of a in the determinant of {6 3] [4 a] is a)6 b)3 c) 0 d)-12 (have the answers just need to know the working to get it)
*March 12, 2008 by Keisha*

**Mathematics**

write the following simultaneous equations in the form of AX= B where A,X and B are matrices 11x+6y=6 9x+5y=7 hence write the solution for x and y as a product of two matrices.
*July 10, 2012 by INDIANA*

**Mathematics**

write the following simultaneous equations in the form of AX= B where A,X and B are matrices 11x+6y=6 9x+5y=7 hence write the solution for x and y as a product of two matrices.
*July 11, 2012 by INDIANA*

**Mathematics**

write the following simultaneous equations in the form of AX= B where A,X and B are matrices 11x+6y=6 9x+5y=7 hence write the solution for x and y as a product of two matrices.
*July 12, 2012 by INDIANA*

**Mathematics **

write the following simultaneous equations in the form of AX= B where A,X and B are matrices 11x+6y=6 9x+5y=7 hence write the solution for x and y as a product of two matrices.
*July 16, 2012 by SAMARA*

**Mathematics**

write the following simultaneous equations in the form of AX= B where A,X and B are matrices 11x+6y=6 9x+5y=7 hence write the solution for x and y as a product of two matrices.
*July 20, 2012 by Samara *

**Algebra II**

Can a matrix have a two digit number? I have to add the matrices[3 4] +[2 7] [7 6] +[3 8] Sorry this is the only way I know haw to put matrices on the board.
*October 27, 2007 by JaneLee*

**Linear algebra**

find the inverse of the following matrices if they exist. [1 -2 3] [3 1 0] [-2 1 1] the following represent a 3 x 3 matrices
*November 21, 2011 by ZUkii*

**Math (matrices)**

No one answered my matrix question. Let me rephrase: Let A, B, and 0 be 2x2 matrices. Assuming that A is invertible and 0 is all zeroes, what is the inverse of the matrix [A|0] [B|A] (that is a 4x4 matrix represented as 4 2x2 matrices) The answer is in the form: [A^-1|0 ] [C |...
*November 16, 2006 by James*

**math**

step by step how do we find the value of x and y in this matrices by the law of matrices (3 2 4 0) (x y)=(7 12)
*October 18, 2011 by swendy*

**math**

step by step how do we find the value of x and y in this matrices by the law of matrices (3 2 4 0) (x y)=(7 12)
*October 18, 2011 by swendy*

**Math**

I have a few questions about T-Matrix. In excel, I am suppose to work with powered matrices to construct a weighted T matrix, using a scalar of .7. Does this mean I multiply each of the powered matrices by .7? Or do I power the powered matrices by .7? Or am I completely off ...
*October 13, 2010 by Lisa*

**Maths - Matrices**

I'm having trouble with doing this matrix proof The question is "Given some matrix A has the property A*2=A^-1, show that determinant A = 1, i.e |A| = 1" I've tried for ages, but I can't seem to do it, this is what I got to A^2= A^-1 |A^2| = |A^-1| |A|^2 = 1/|A| Can someone ...
*March 29, 2009 by TP*

**Maths: Algebra Matrices Class 12th**

matrix{{0, 1, -1}, {2, 1, 3}, {1, 1, 1}} matrix{{1, -1, x}} matrix{{0}, {1}, {1}}=0 Find the value of x Don't give me the direct answer. Please tell me how to go about this. Draw in your notebook and then solve
*April 11, 2011 by Akash*

**math**

Two matrices can be multiplied only if their sizes are compatible. Suppose that U is an m × n matrix, and that V is a p × q matrix. In order for U•V to make sense, what must be true of the dimensions of these matrices? Although matrix multiplication uses dot products, it is ...
*April 15, 2010 by yadlay*

**maths**

a matrix X has a+b rows and a+2 columns while the matrix Y has b+1 rows and a+3 columns. both matrices XY and YX exist. find a and b. can you say XY and YX sre of same type? are they equal?
*April 4, 2013 by edward*

**Math**

Matrices are as follows reading left to right: X=MatrixForm{{0,1},{1,0}} Y=MatrixForm{{0,-i},{i,0}} Z=MatrixForm{{1,0},{0,-1}} H=MatrixForm 1/sqrt(2){{1,1},{1,-1}} S=MatrixForm{{1,0},{0,i}} T=MatrixForm{{1,0},{0,exp(i(pi)/4)}} v=MatrixForm{{alpha},{beta}} Show by computation ...
*September 17, 2013 by Anon.*

**math**

What does it mean to have two matrix variables written vertically inside parentheses? In other words, if A and B are matrices, what does this mean (imagine there is one set of parentheses spanning both rows): (A) (B) I'm trying to understand a least squares problem like this...
*January 7, 2009 by sergei*

**Algebra II (Matrices)**

My book doesn't solve it like a linear equation, they solve it by using inverse matrices. Solve the matrix equation: |4 -5||m|=|32| |1 2| |n|=|-5| A= |4 -5| |1 2| X= |m| |n| B= |32| |-5| Step 1. Find the inverse of the coefficient matrix. A^-1= 1/13|2 5| |-1 4| (I get confused...
*February 29, 2008 by Jon*

**Math**

There are 18 animals in the barnyard. There are 50 legs. How many cows and how many chickens are there in the barnyard? Technically, I wonder if a chicken is an animal. And are chickens and cows the ONLY "animals" in the barnyard. If we assume a chicken is an animal and that ...
*November 27, 2006 by Miranda*

**Precalculus**

Find the values of x and y. Matrices.. [-4 2 3 5 3 5 2 -3 1] TIMES [2 x 5] EQUALS [9 38 y] It is difficult for me to type the matrices in but.... The first matrix is 3x3 consisting of -4,2,3 in the first row.. 5,3,5 in the second row ......2,-3,1 in the third row... Then ...
*May 21, 2014 by Anonymous*

**Hall**

how do you do matrices
*December 19, 2007 by Tiarre*

**math**

Why is (AB)^-1 = B^-1A^-1 in matrices, and not (AB)^-1 = A^-1B^-1
*December 16, 2009 by katy*

**math**

4x-y+z=-5 2x+2y+3z=10 5x-2y+6z=1 solving x,y,z with Matrices
*May 4, 2008 by yumei*

**math**

(3 2 4 0) (x y)=(7 12) find x and y in this matrices
*October 18, 2011 by swendy*

**math**

4x-y-3z=8 2x+2y-z=3 6x+y-3z=2 help me solve matrices
*March 13, 2013 by jenny*

**math**

solve system by matrices 2x+3y-z=-8 x-y-z=-2 -4x+3y+z=6
*February 24, 2009 by jessica*

**math**

solve this system by matrices 2x+3y-z=-8 x-y-z=-2 -4x+3y+z=6
*February 24, 2009 by jessica*

**math**

linear matrices? how to solve?
*May 7, 2009 by me*

**math**

(B-C)^2=(C-B)^2, Where B and C are (n x n) in matrices.Is it true or false.
*April 15, 2011 by Fakaapo. Suetusi*

**math**

Solved problems on matrices
*November 6, 2011 by Dm*

**matrices**

find the sum or differnce [ -2 -1 7 ] [ -2 0 8 ] [0 -3 2 ] + [-9 5 -1 ]
*August 26, 2013 by skyler*

**Math**

The Mountain Trail Resort sold 64 condominiums last year, all 1, 2, or 3 bedroom condominiums. The total revenue from the sale of the condominiums was $5,493,000. The combined square footage of all the condominiums sold was 51,544 square feet. One bedroom condominiums sold for...
*November 2, 2009 by please help(:*

**MATH!**

The Mountain Trail Resort sold 64 condominiums last year, all 1, 2, or 3 bedroom condominiums. The total revenue from the sale of the condominiums was $5,493,000. The combined square footage of all the condominiums sold was 51,544 square feet. One bedroom condominiums sold for...
*November 2, 2009 by hmmm...*

**MATH!**

The Mountain Trail Resort sold 64 condominiums last year, all 1, 2, or 3 bedroom condominiums. The total revenue from the sale of the condominiums was $5,493,000. The combined square footage of all the condominiums sold was 51,544 square feet. One bedroom condominiums sold for...
*November 2, 2009 by hmmm...*

**Algebra II**

Solve this system using matrices. 3.7x - 2.3y + 4.2z = 8 2.6x + 4.6y - 3.9z = 10 8x + 2z = 20
*October 26, 2007 by JaneLee*

**math**

matrices: A=[-5 4 -6 B=[-2 4 -5 9 -8 7 8 9 3 4 -3 9] 5 -2 2] AB=? please show the work if you can.
*February 8, 2010 by anonymous*

**math**

matrices: A=[-5 4 -6 9 -8 7 4 -3 9] B=[-2 4 -5 8 9 3 5 -2 2] AB=? please show work if you can.
*February 8, 2010 by anonymous*

**math**

how will you solve these equations using matrices x+y=1 and 3x-2y=4/3
*June 27, 2010 by sha*

**math **

(B-C)^2=(C-B)^2 ,where B and C are (n x n) matrices.what is the answer, it is true or false
*April 18, 2011 by Fakaapo*

**Matrices**

Gaussian row elimination method: (i) x+3y+z=4 x-2y-2z=3 2x+y-z=9 (ii) x+2z+y=0 2x+y+z=6 3x+3y+2z=14
*August 13, 2011 by Zinnia*

**MathJ.C.**

Solve the system using matrices 4x+2y=2 5x+8y=30
*October 22, 2013 by JaimeC.*

**math (matrices)**

Find the values of x and y for which: [2y+5] [x-1] [y - 2] = [ 3x ] is true. a. (-1, -1) b. (-2, -4) c. (5, 1) d. (-1, 4) I got B...?
*May 24, 2009 by sophie*

**MATH**

Perform the operation for each equation, if there is a solution (Matrices) [4k -8y ] [5k+6y 2k+1] [6z - 3x] - [2z+5x z+4] [2k + 5a] [4k+6a 3a+2]
*December 1, 2010 by Daria*

**Math.**

The Mountain Trail Resort sold 64 condominiums last year, all 1, 2, or 3 bedroom condominiums. The total revenue from the sale of the condominiums was $5,493,000. The combined square footage of all the condominiums sold was 51,544 square feet. One bedroom condominiums sold for...
*November 2, 2009 by please help(:*

**Analytic Geometry**

Solve each equation using augmented matrices. 2x+y-2z=7 x-2y-5z=-1 4x+y+z=-1
*October 3, 2007 by Anonymous*

**math **

Solve the following system of equations using matrices x = -2y + 6 2x + 2y = 16
*July 15, 2011 by kailin*

**Math **

solve the following system of equations using matrices 4x-2y=7 7x+y=13
*July 29, 2014 by Keya *

**algebra 2--matrices.**

A grocer wants to m,ix three kinds of hard candy to sell for $2.40 per pound. He need 50 pounds of candy altogether. He mixes sour balls worth $3.50 per pound,butterballs worth $2.50 per pound, and starlight mints worth $1.75 per pound. He mixes twice as many butterball as ...
*February 21, 2010 by Alyssa.*

**math**

Solve the following matrices.(sORRY I DONT KNOW HOW TO DO THE BRACKETS) B= 1, -4 -2, 1 3, 0 D= 0, 1 1, 0 G= -3, 1 4, 5 FIND: a) DG = b) GD = c) BG = d) DD = e) GG =
*November 30, 2008 by heidi*

**math**

solve the following system of the equations using matrices 10x-5y=4 7x+y=10
*August 11, 2014 by Keya *

**Math**

Make a complete re search project on maths is interconnected with other subject i.e. Maths Vs computer using art with maths.
*June 5, 2012 by Shivansh Tomar*

**Math**

Suppose A and B are non-zero matrices such that A^2=0 and B^3=0(But B^2 does not =0) find in simplst form: a)(A+B)^2 b)(A+B)^3 c)(A+B)^4 d)(A+B)^5 e)(A+B)^6
*October 29, 2008 by Amanda*

**Algebra**

How would you solve this matrices using the Gauss-jordan elimination method? {[-5, 8, 10]} {[5, 8, 4]} {[10, 8, 5]} {[5, 4, 8]}
*May 18, 2009 by Jesse*

**maths letaracy,history,geography and life science **

im going to grade 10 next year,and i want to be a psychologist and im going for maths letaracy and history feild im realy not good with maths and i just found out a few weeks ago that i need pure maths to do psychology.i dont know what to do now ,i also dont know the jobs ...
*October 26, 2013 by khanyisa maringa*

**Linear Algebra**

Suppose A and B are non-zero matrices such that A^2=0 and B^3=0(But B^2 does not =0) find in simplst form: a)(A+B)^2 b)(A+B)^3 c)(A+B)^4 d)(A+B)^5 e)(A+B)^6
*October 29, 2008 by Amanda*

**Linear Algebra**

Find the inverse of the matrices if they exist. Use the algorithm introduced in this section. 1 2 -1 -4 -7 3 -2 -6 4
*October 5, 2011 by Allan *

**Pre-Calc**

I have to solve these using matrices by hand. Can someone please help me? 2x-3y-2z=4 (1/4)x-(2/5)y+(3/4)z=(-1/3) -2x+1.3y-3z=5 Thank you so much! :)
*December 3, 2012 by Tori*

**Maths - Matrices**

Matrix transformations- please help? let f be the linear transformation represented by the matrix M = (4 2) .......(0 -2) a) state what effect f has on areas and whether it changes orientation b) Find the matrix that represents the inverse of f c) Use the matrix you found in ...
*May 22, 2008 by Anonymous*

**Pre-Calculus/Trigonometry**

Solve the following system of equations algebraically. Verify your solution by using matrices. 3x-y=0 5x+2y=22
*September 29, 2014 by Anonymous*

**maths a**

Charlotte received a score of 68 on both her English and Maths tests. The mean for English was 52 and the mean for Maths was 55. The standard deviations for English and Maths were 10 and 8 respectively. In which subject did Charlotte perform better? Explain your decision. ...
*September 11, 2014 by jay*

**Maths B**

Charlotte received a score of 68 on both her English and Maths tests. The mean for English was 52 and the mean for Maths was 55. The standard deviations for English and Maths were 10 and 8 respectively. In which subject did Charlotte perform better? Explain your decision.
*May 24, 2012 by Anna*

**Maths B**

Charlotte received a score of 68 on both her English and Maths tests. The mean for English was 52 and the mean for Maths was 55. The standard deviations for English and Maths were 10 and 8 respectively. In which subject did Charlotte perform better? Explain your decision.
*May 24, 2012 by Anna*

**Buisness Math**

Given the following matrices: Compute (i) AB (ii) A+2B (iii) AC (iv) 5C (v) B-C Note:Give proper reason where computation is not possible.
*December 8, 2013 by Syed Muhmmad ibadulah*

**PRECALC QUESTION**

Solve for "x" and "y" given the following matrix equation: (2x, 0.5y, -2, 1) * (3, -2, 0, 1) = (-24, 19, -6, 5) (the matrices are going from left to right, they're all 2x2's.)
*May 25, 2014 by Aly*

**Pre-Calculus/Trigonometry**

Solve the following system of equations algebraically. Verify the solution by using matrices. 8x-2y=5 -12x+3y=7
*September 30, 2014 by Anonymous*

**math**

Let A,B and C be matrices such that A=⎛⎝132213⎞⎠, B=(122423) and C=AB. What is the sum of all the elements (entries) of matrix C?
*April 16, 2013 by ayan*

**math**

Solve the following matrices (I dont know how to do brackets so I will just use commas to seperate the numbers and put them in different lines) A= 0, -2, 3, 1 -3, 1, 0, 4 0, 5, -2, -1 B= 1, -4 -2, 1 3, 0 C= -1, 0, 2 0, 3, 4 0, 8, -1 E= 1 2 3 4 F= -2, 5 3, 7 0, 9 FIND: ) AE = b...
*November 30, 2008 by heidi*

**algebra**

I having serious problems trying to solve this equation please help me find the product matrix for this input-output and demand matrices A= [ 0.1 0.03] D= [5] [ 0.07 0.6] [10]
*April 26, 2014 by JC*

**Algebra**

Find the coordinates of the image after a reflection in the given line. [-8, 1, -7] [-7, -5, 1]; y axis I am really bad with these types (matrices) of questions, please help me.
*May 26, 2014 by Sarah*

**pre-calc**

solve each system of equations using matrices x+2y-3z=0 2x-4y=z=-7 -2x+2y-3z=4 I dont see how it is possible to even attempt a matrix on this text oriented site.
*October 24, 2006 by Erica*

**Algebra II**

1. solve this system using matrices: 3.7x-2.3+4.2z=8 2.6+4.6y-3.9z=10 8x+2z=20 2. Write this system as a matrix equation: -2x+y=8 7x-3y=10
*October 23, 2007 by JaneLee*

**math**

Solve the equation. 5 1 -4 2 -3 -5 X= 5 7 2 -6 2 5 The numbers are supposed to be matrices. I'm not sure how I would solve the problem
*October 30, 2013 by Anonymous*

**Math**

Let A, B, and 0 be 2x2 matrices. Assuming that A is invertible, find a matrix C such that [A^-1|0 ] [C |A^-1] is the inverse of the partitioned matrix [A|0] [B|A]
*November 16, 2006 by James*

**Math**

For questions 1 and 2, use the matrices below: A=[17 2 3] [11 4 -9] B=[10 6 -7] [-4 3 0] C=[1] [2] [-2] 1)Find A-B [17-10] [2-6] [3--7] [11--4] [4-3] [-9-0] =[7 -4 10] [15 1 -9] 2)Find BC, if possible. 10(-1) 6(2) -7(-2) -4(-1) 3(2) 0(-2) =[-10 12 14] [4 6 0] (I hope this ...
*February 26, 2008 by Jon*

**Algebra**

16. I am supposed to multiply the matrices B and C by each other B is: 7 6 2 -3 -1 8 9 5 and C: 0 8 -2 1 Would someone mind showing me how to multiply CB? Thanks ~Saria
*January 5, 2009 by Saria*

**Linear Algebra**

V = Mnxn is a space vector formed by all the square matrices. Is W = {A in Mnxn : A^x = A} a subspace of V? Thanks
*May 1, 2009 by Isaac*

**Programming**

(i) What is binary tree (ii) Write a program to multiply any two matrices. (use any program of choice)
*October 8, 2009 by Beta plus*

**Math Linear Algebra**

Find the inverses of the matrices. Let A = 1 2 5 12 b1 = -1 3 b2 = 1 -5 b3 = 2 6 b4 = 3 5 Find A^-1, and use it to solve the four equations. Ax = b1, Ax = b2, Ax = b3, Ax = b4
*October 5, 2011 by Allan *

**Math **

[R] = [4/5 -3/5] and [S] = [-3/5 4/5] [-3/5 -4/5] and [4/5 3/5] are reflection matrices. Calculate [R·S] and verify that it can be identified as the matrix of rotation. Determine the angle of the rotation.
*October 17, 2014 by Wes*

**maths**

i am told to do a project in maths it should involve a maths consept.pls help as to what should i do?
*November 18, 2007 by chandini*

**Linear Algebra**

Give example of two non-zero matrices A and B such that A^2=0, B^2=0 but AxB and BxA do not equal zero.
*November 6, 2008 by Amanda*

**college- Linear Algebra**

Give example of two non-zero matrices A and B such that A^2=0, B^2=0 but AxB and BxA do not equal zero.
*November 6, 2008 by Amanda*

**Linear Algebra**

Find an example of 2 by2 matrices with a12 = .5 for which: a. A^2 = I b. A^-1 = A^T c. A^2 = A By the way, a12 means the first row and second column.
*February 18, 2012 by fatih*

**Solving system of linear equations**

I already know the 3 methods of doing it, but I recently found out about using matrices to solve it. How exactly do you do that? All I can remember is something with rref on my calculator.
*February 22, 2009 by Chopsticks*

**Algebra**

[4,3_1,2]-[1,1_1,0]+[1,1_1,4] Re posting this one. this is a matrice and the question says perform the indicated operations where possible I do not understand matrices at all.
*December 16, 2009 by mike*

**Math**

How to add matrices that involve improper fractions? I have this assignment and one of the questions were: C= [ 7 11] D= [ 1 0 ] [ -15 3] [ 4 -11/12] This is what I have so far C+D= [ 8 11 ] -11 25/12 So the 25/12, do I keep it that way or do I convert it to a decimal?
*May 29, 2014 by Ninan*

**Algebra**

Let A and B be n x n matrices, assume AB is invertible and show that both A and B are invertible. what? AB is invertible -----> There exists a matrix X such that: (AB)X = 1 But (AB)X = A(BX). So, AY = 1 for Y = BX Also: X(AB) = 1 And thus ZB = 1 for Z = XA
*May 31, 2007 by Ashley*

**Maths**

A school has eleven Year 9 Maths classes of 27 students. Each class has 4 extra students added to it. Find the total number of students studying Year 9 Maths.
*February 26, 2009 by Jessica*

**linear algebra**

Prove that the trace is a similarity invariant. In other words, if two matrices are similar, then they must have the same trace. Got the answer from Wikipedia: tr(AB) = tr(BA) tr(ABC) = tr(CAB) tr(P^-1 * A * P) = tr(P^-1 * P * A) = tr(A)
*July 20, 2007 by mathstudent*

**Algebra-Matrix**

How would I do these Matrices? 1. |1/2 14 10 -8| 2, Let matrix A = [8 -2 4 7 ] Let matrix B = 2A, Find b_22
*August 12, 2011 by lizzie*

**Algebra(check pt 3)**

1)The dimensions of ST. S[7/12 -1/9] [-1/3 1/9] T[4 -5 2] [8 -1 3] answer=2x3 2)The pair of matrices that are inverses. P[3 1] Q[4 4] R[0 -1/4] [-4 0] [12 21] [1 3/4] S[7/12 -1/9] T[4 -5 2] U[-9 6 4] [-1/3 1/9] [8 -1 3] [-5 -2 3] V[3 1] [0 2] [-4 5] answer=S and R 3)Find the ...
*July 28, 2007 by erin*

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