math, algebra II
posted by student .
Can someone explain to me step by step how the book got to this answer i want to understand the steps....thanks
Find the inverse, if it exists,for the matirx (*I used the underscore to separate the numbers within the matix)
2_1_3
3_1_2
4_2_0
the answer is:
4_6_5
8_12_13
2_0_1
The answer you supplied is really not the Inverse matrix since when you multiply the two you get
6 0 0
0 6 0
0 0 6 so each of the numbers in your answer should be divided by 6
There are several ways to find the inverse depending on your level of math knowledge.
Here is a rather straightforward way
let
│2_1_3│ │a b c│ │1 0 0 │
│3_1_2│ │d e f│=│0 1 0 │
│4_2_0│ │g h i│ │0 0 1 │
from this we get
2a + d + 3g = 1
3a  d + 2g = 0
4a + 2d = 0
and
2b + e + 3h = 0
3b  e + 2h = 1
4b + 2e = 0
and
2c + f + 3i = 0
3c  f + 2i = 0
4c + 2f = 1
this gives you 3 systems of 3 equations in 3 variables to solve which do not appear to be that difficult.
Let me know what you got.
(Also check my math, I did not check it)
Respond to this Question
Similar Questions

math help
Can someone explain to me the following step by step , i 've looked in websites , plus the book and i want to understand how this problem has this answer. Problem #1 Find the inverse if it exists, for the matrix. 2_1_3 3_1_0 4_2_0 … 
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 5m=32 1 2 n=5 A= 4 5 1 2 X= m n B= 32 5 Step 1. Find the inverse of the coefficient … 
Algebra help
f(x)=x^34x^2x+4 How do I find the xintercept for this? 
ALGEBRA HELP
When solving the equation, what property was used to go from step 3 to step 4? 
math ergent please please...
10.a)Solve the inequality x^35x^2+2x+8<0 by i) using intervals ii) considering all cases I did this but my teacher said that when i solved this: x^35x^2+2x+8<0 (x+1)(x^26x+8) (x+1)(x4)(x2)<0 She told me to show all the … 
MAth
2+3m=17 7 6 10 5 use inverse operations to solve each equation. Explain each step and identify the propaty used to reach steps. 19=h/38 solve the equation : expiation each step and identify the property used to reach each step 0.6x+0.8=1.4 … 
MAth
2+3m=17 7 6 10 5 use inverse operations to solve each equation. Explain each step and identify the propaty used to reach steps. 19=h/38 solve the equation : expiation each step and identify the property used to reach each step 0.6x+0.8=1.4 … 
Math
I don't understand how the derivative of tanx/x equals sec^2x/x. I got sec^2x/(x^2) by the quotient rule. Can someone explain to me step by step please? 
Math
I need help solving the problem not the answer. (Multiple Choice) The steps below show the incomplete solution to find the value of x for the equation 7x + 8 − 3x = −6 + 10: Step 1: 7x + 8 − 3x = −6 + 10 Step 2: 7x + 8 − … 
Help PLZ!!
consider the steps to simplify the expression. Which property is used to reach Step 3?