Question

Solve this matrix multiplication.

Answer 1

I used calculator for this..XD

Answer 2

I know the answer is -48 -24
24 40
but I want to know how to solve it. I multiplied the matrices first, but it didn't work. I multiplied every number by 4, but that didn't work either

Answer 3

Keep in mind that for 2 matrices A and B, A x B <> B x A. Second, the column of the left matrix must be equal to the row of the right matrix. Third, the resultant matrix will have the order of row = row (left matrix), column = column (right matrix). For example, A = 3x2, B = 2x4, then AxB = 3x4 (to be continued...)

Answer 4

Wait, but I still get 0 for the first number of the matrix. How is the first number -48?

Answer 5

i'm the OP btw

Answer 6

OHHHHHHHHHHHH I was supposed to ADD, not SUBTRACT!! Duh!

Answer 7

Alright, I got the right answer. Thank you :)

Answer 8

a11 = (-3)(-2) + (-6)(-1) = 12
a12 = (-3)(6) + (-6)(-4) = 6
a21 = (1)(-2) + (4)(-1) = -6
a22 = (1)(6) + (4)(-4) = -10
Multiply the result by 4.