Question

Given matrices A, B, and C below, perform the indicated operations if possible. If the operation is not possible, explain why.
Matrices - http://i.imgur.com/utipicD.png
3A+B
2B+C
CA

Answer 1

for addition you need same size matrices

Answer 2

for multiplication
if the columns of the first matrix must equal the rows of the 2nd matrix

Answer 3

wait lemme see that doesnt sound right

Answer 4

ya thats right

Answer 5

carry on

Answer 6

So for the first 2 the operations aren't possible because they aren't the same size?

Answer 7

A and B have same size

Answer 8

Okay so how would we add them? :s

Answer 9

http://www.mathportal.org/linear-algebra/matrices/matrix-operations.php

Answer 10

i don't get it

Answer 11

Can anyone explain it better than that? :S

Answer 12

the first one is possible; matrices A and B are both 3x3

Answer 13

to find 3A, multiply each element in A by 3

Answer 14

so 3A = {{6,-3,0},{0,15,.9},{3,12,30}}

Answer 15

to find 3A+B, add each element of 3A to each element of B

Answer 16

yes DAN815 IS RI8