Math: determinants

If det(A)=-7
A= | a b c |
| d e !@#$%^&
| g h i |

Find det(2A^-1), det((2A)^-1).
| a g d |
| b h e |
| c i f |

  1. 👍 0
  2. 👎 0
  3. 👁 57
asked by Amelie
  1. As you can see from your own post, it is very difficult to type and show matirices and determinants in this format.

    Take a look at these sites, thy summarize most of the important properties very nicely.

    1. 👍 0
    2. 👎 0
    posted by Reiny

Respond to this Question

First Name

Your Response

Similar Questions

  1. Linear Algebra

    Hi, I really need help with these True/False questions: (a) If three vectors in R^3 are orthonormal then they form a basis in R^3. (b) If Q is square orthogonal matrix such that Q^2018 = I then Q^2017 = Q^T. (c) If B is square

    asked by Matt on March 26, 2017
  2. algebra-det.

    a) Suppose that B is an n ¡Á n matrix, and k is a scalar. Give a formula for det (kB) in terms of det B . b) Show that your formula from (a) is true for all n and for any k. det (kB) = k^n det B This is because the determinant

    asked by Vidal on June 10, 2007
  3. linear algebra

    If A, B, and C are 3×3 matrices; and det(A) = −3, det(B) = −2, and det(C) = −1 then compute: det(2A^−1C^−1A^TC^2B^2) = 0

    asked by sal on October 27, 2018
  4. math

    Is the only way to check if a set of vectors are linearly indep. is if the det does not equal 0? I have a problem where v1= [1;2;1;-1] v2=[0;2;1;1] v3=[3 1 0 2] but this creates a 3X4 matrix and you can't find the det of this. I

    asked by kirsten on March 4, 2015
  5. Algebra

    A is a 2 by 2 matrix. Given that A=(5 1) (1 5) , what is the value of det(A)? det(A) is determinant of A

    asked by Stranger on March 18, 2013
  6. Linear Algebra

    Suppose C and D and 5x5 matrices and det(C)=5, det(D)=6. Compute the determinant of the matrix 3C^T (4CD)^-1 C^2. Justify your answer by stating explicitly which calculation rules for the determinant you use.

    asked by Brody on March 5, 2014
  7. Math

    Suppose C and D are 2 × 2 matrices with det(C) = −3 and det(D) = 2. Find the determinant of the matrices 8C^3D2 and 5 C^-1

    asked by Amelia on December 3, 2017
  8. 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

    asked by James on November 16, 2006
  9. math-urgent

    show that if A= A inverse, then det(A) = +/- 1 if A(transpose) = A(inverse), what is det(A)?

    asked by jessica on February 5, 2015
  10. algebra 2

    find the inverse of A, recall that A-1 = 1/det A [d -b] [ -c a]

    asked by skyler on August 26, 2013

More Similar Questions