- #1

astonmartin

- 23

- 0

## Homework Statement

Suppose A and B are 3 x 3 matrices and det A = x ≠ 0 while det B = y. Let

C be the matrix ((2A)^-1 )B <-- (2A) inverse x B

then det C is:

## Homework Equations

## The Attempt at a Solution

det(2A) = 2x, so det 2A inverse = 1/(2x)

det C = y/(2x)...which is not one of the solutions

a) y/8x b) 2xy c) -2y/x d) 2y/x e) 8y/x

what am I missing here?