Question

What is the determinant of

https://lincolnlearningsolutions.brainhoney.com/Resource/19809088,B84/Assets/assessmentimages/alg%202%20pt%202%20u3l5%2019.jpg

a)434
b)-558
c)-434
d)558

Answer 1

You know how to solve determinants ?

Answer 2

not at all

Answer 3

3x3 determinants in particular I mean

Answer 4

Okay, there's several ways to do this but for this case we'll go for the straight forward way of solving a 3x3 determinant.

Answer 5

I'd rather teach you the method instead of giving you the result like that because you'll likely have to deal with this some other time as well.

Answer 6

okay

Answer 7

Given a 3x3 matrix, something like this

Answer 8

The determinant of the matrix will be :

a1 * a5 * a9 + a4 * a8 * a3 + a2 * a6 * a7 -
(a3 * a5 * a7 + a6 * a8 * a1 + a2 * a4 * a9)

Answer 9

Now this looks like a pain in the a** to memorize but there's a neat catch / trick to memorize this nicely

Answer 10

okay lol