Question

Algebra 2 Help!

Answer 1

@jim_thompson5910

Answer 2

for # 2a, if you have the 2x2 matrix


a b
c d


then the determinant of that matrix, call it D, is

D = a*d - b*c

Answer 3

does that help for 2a?

Answer 4

I'll try to do it based on what you wrote, hold on

Answer 5

ok

Answer 6

so the answer would just be -17, nothing has to be written as a matrix?

Answer 7

the answer is -17 and the answer is a scalar (single number) and not a matrix

this is just based off what a determinant is

Answer 8

o ok so how do I do 2b?

Answer 9

2b is a bit tougher

Answer 10

I'm going to show you how to do it, but unfortunately there are multiple lengthy ways to do it (hopefully this is what you've learned before)

Answer 11

Ok

Answer 12

you first start off by writing the matrix down