SOLUTION: help a girl out!! f(x) = 15x^3 + 13x^2 - 15x + 15 g(x) = 15x + 11 find g(f(9)) A 639 B-5943226 C-52466 D-6288203 E 178031 F -4595

Algebra ->  Quadratic Equations and Parabolas  -> Quadratic Equations Lessons  -> Quadratic Equation Lesson -> SOLUTION: help a girl out!! f(x) = 15x^3 + 13x^2 - 15x + 15 g(x) = 15x + 11 find g(f(9)) A 639 B-5943226 C-52466 D-6288203 E 178031 F -4595       Log On


   

Question 791771: help a girl out!!
f(x) = 15x^3 + 13x^2 - 15x + 15
g(x) = 15x + 11
find g(f(9))
A 639
B-5943226
C-52466
D-6288203
E 178031
F -4595

Found 2 solutions by solver91311, MathLover1:
Answer by solver91311(24713) About Me  (Show Source):
You can put this solution on YOUR website!


Write in pencil. Erase each of the s and replace it with . Do the arithmetic indicated. Given correct arithmetic, you will have the value of

Write in pencil. Erase each and replace it with the value of previously calculated. Do the indicated arithmetic.

John

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Answer by MathLover1(20849) About Me  (Show Source):
You can put this solution on YOUR website!
f%28x%29+=+15x%5E3+%2B+13x%5E2+-+15x+%2B+15
g%28x%29+=+15x+%2B+11
find g%28f%289%29%29
first calculate f%289%29, then calculate the value of g at the value of f%289%29:


f%289%29+=+15%2A9%5E3+%2B+13%2A9%5E2+-+15%2A9+%2B+15
f%289%29+=+15%2A729+%2B+13%2A81+-+15%2A9+%2B+15
f%289%29+=+10935+%2B+1053+-+135+%2B+15
f%289%29+=+11868
g%28f%289%29%29+=+15%2A11868+%2B+11
g%28f%289%29%29+=+178020%2B+11
g%28f%289%29%29+=+178031
so, your answer is: E+178031