Question

Evaluate the determinant of the matrix
[-4 5 6]
[0 4 4 ]
[-2 -5 4]

Answer 1

I need help

Answer 2

@Majesty69

Answer 3

do it from the 2nd column as that has a zero in it

Answer 4

https://www.youtube.com/watch?v=I9mXoN8HG7M

Answer 5

so

0{whatever, we don't need to know} - 4 {(-4)(4) - (-2)(6)} + 4{(-4)(-5) - (-2)(5)}

Answer 6

look through that, hope there are no typos and see if you recognise the pattern . if not, here's a nice colourful and helpful guide, just scroll down a bit...
http://www.mathsisfun.com/algebra/matrix-determinant.html

Answer 7

thank you @Austin6i6