Question

How do I find 5a-4b????

Answer 1

(e).

Explanation:

5A =
`\left[\begin{array}{ccc}5(-9)&5(-7)&5(7)\\5(5)&5(-1)&5(7)\end{array}\right]`

4B =
`\left[\begin{array}{ccc}-28&28&24\\-4&28&24\end{array}\right]`

5A - 4B =
`\left[\begin{array}{ccc}-17&-63&11\\29&-33&11\end{array}\right]`

Answer 2

Explanation:

e is the required answer.hope this helps