Given #A=((-1, 2), (3, 4))# and #B=((-4, 3), (5, -2))#, how do you find AB?
Check first whether the matrices are compatible?
are compatible (the middle numbers in red are the same)
and will give a
The elements in each ROW in A must be multiplied by the elements of the COLUMNS of B, then find the sum each time.
The separate calculations give: