We are just subbing in our matrices for the variables: First we find 2B or not to be? Nah, that's not the question. Just 2B, and we do that by multiplying 2 through B entry by entry: 2B = (2)(1) = 2; (2)(5) = 10; (2)(4) = 8; (2)(2) = 4 And we are left with an addition problem: Naturally we remember that we just add them entry by entry to find the answer: 2 + 0 = 2; 10 + 2 = 12; 8 + 0 = 8; 4 + 1 = 5 and |