Question

72. Evaluate 5a + 3a2 when a = - 3

Answer 1

`5a + 3 {a}^(2) \\ = 5( - 3) + 3( { - 3}^(2) ) \\ = - 15 + 3(9) \\ = - 15 + 27 \\ = 12`

I hope I helped you^_^

Answer 2

12

Explanation:

5a + 3a^2 when a = -3

~Substitute

5(-3) + 3(-3)^2

~Simplify

-15 + 3(9)

-15 + 27

12

Best of Luck!