Question

- f(x) = 4(x + 3)2 +1
Find f(-9).
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Answer 1

this function does not look right . . .as the parenthesis are being multiplied twice . . .but as it is written it would be 623

Explanation:

-f(x) = 4(9x+3)2 +1 find f(-9)

multiple (9x + 3) by 8 (which is the 4 and the 2 multiplied together)

8(9x + 3) + 1

72x + 24 +1 (distributing the 8)

72x +25 (adding like terms)

substitute -9 in for x

72(-9) +25 72(-9) = -648 +25

combine like terms -f(-9) = -623

but since it is a negative function you would divide both sides

solution: f (-9) = 623

Answer 2

my answer is -24

what other i don't know

hope it will help you