Question

Determine whether the matrix has an inverse. If an inverse exists, find it.

-5 -18
2 7

Answer 1

yes

Answer 2

so, what is it?

Answer 3

hehe, don't leave us in suspense :P

Answer 4

So how do you find the inverse of that matrix

Answer 5

well, let's find the DETERMINANT first, can you find the determinant of that 2x2 matrix?

Answer 6

read it,at the middle page http://www.mathsisfun.com/algebra/matrix-inverse.html

Answer 7

@douglas12
If you are allowed to use technology in your work, check out the online matrix inverse calculator at
http://www.bluebit.gr/matrix-calculator/

Answer 8

@douglas12 Post what you get as the inverse.