Question

F(x) = 2x2 + 5x + 20
Find f(-9)

Answer 1

Answer: f(-9)=137

Explanation:

To find f(-9), you plug in -9 into x.

f(-9)=2(-9)²+5(-9)+20 [solve parenthesis]

f(-9)=2(81)-45+20 [multiply]

f(-9)=162-45+20 [subtract]

f(-9)=117+20 [add]

f(-9)=137