Question

inverse for matrix 3x3 quickly ?

Answer 1

I know 2 ways of inverting a 3x3

1st method:
http://www.wikihow.com/Inverse-a-3X3-Matrix

2nd method
let A be a 3x3 matrix then
A^(-1) = [A I]
so line it up with the identity and row reduce to reduce row echelon form

Answer 2

they both take a while to do but im gonna go with the 1st method i metioned as faster since its easier to make mistakes on the 2nd method than the 1st one

Answer 3

use calculator.!!! XD