Disregard my previous answer...see Iso's post below...XD2.) Let A be an M x N matrix and B be an N x P matrix.
(a) How many multiplications are needed to calculate AB?
I'm not sure what is to be done here...(b) How many additions are needed to calculate AB?
Hint: the dimension of is 1 x 1 and the dimension of is 3 x 3.3.) Find (X)(X^T) and (X^T)(X), where X = (1,-1,2).
Note: X^T is the transpose of X.
Any help would be very very very much appreciated. I'm so desperate!
Can you try to take it from here?