Question

5. Let A = 1 4

2 3

and B = 3 -2
4 6

calculate the entry in the second row, second column in AB

Answer 1

multiply the 2nd row of A by the 2nd column of B:

(2)(-2)+(3)(6) = 14

Verify at

http://www.wolframalpha.com/input/?i={{1%2C4}%2C{2%2C3}}*{{3%2C-2}%2C{4%2C6}}