For linear algebra and matrices i am given A and B matrix an

For linear algebra and matrices, i am given

A:

and B:

matrix and am asked to compute the following entries of AB: the (1,2) entry and the (3,3) entry... I\'m not understanding what this is this asking for

Solution

(i,j) entry in AB means the entry in ith row and jth column of AB

A is a 3x3 matrix

B is a 2x3 matrix

So, AB is not possible because to multiply matrices A and B we need number of columns of A must equal number of rows of B which is not true.