Question

If f(x) = 1/3x^2 + 5, find f(-9).
A. 248
B. -22
C. 11
D. 32

Answer 1

D. 32

Explanation:

f(-9) = ⅓(-9)² + 5

⅓(81) + 5

27 + 5

32

Answer 2

D. 32

Explanation:

For this problem, we simply plug -9 in for x in f(x):

`f(x)=(1)/(3) x^2+5` ⇒
`f(9)=(1)/(3) *(9^2)+5=(1)/(3) *81+5=27+5=32`

Thus, the answer is D. 32.

Hope this helps!