Question

Anyone know how to solve this?

Answer 1

@Mertsj

Answer 2

multiply rows by columns...add values for the single index...like so:
(-2 * -1) + (5 * 2) = 12
(1 * -1) + (-2 * 2) = -5

Answer 3

@tehmagik yeah i just figured it out, thanks you!

Answer 4

@tehmagik so for this one the answer is A right?

Answer 5

Yep, it's A

Answer 6

something to keep in mind: multiplying matrices isn't like multiplying numbers. multiplying matrices in different orders yields different answers (with a few exceptions, of course)

Answer 7

@tehmagik i dont understnad this one, can you help me

Answer 8

@tehmagik im guessing its D since i think you multiply the same thing but negative

Answer 9

Yes - to negate a matrix you negate each value within it. D is correct.