Question

1. Find the value of the expression: 3a2 + 4, when a = -4

2. Find the value of the expression: 2a3, when a = -4

Answer 1

Explanation:

1. 3a2 + 4

3(-4)2+4

=-24+4

=-20

2. 2a3

2(-4)3

= (3)(−4)(3)

= −36