Question

if f(x)=2x+1 and g(x)=x^2-7 find (fog)(2)

Answer 1

@iGreen please can you help

Answer 2

I think you multiply \((2x + 1)(x^2-7)\)., then multiply it by 2..

Answer 3

thats what i was thinking but im not 100% on it

Answer 4

Can you multiply \((2x + 1)(x^2 - 7)\)?

Answer 5

yep give me a second

Answer 6

I;ve gotten -5

Answer 7

is that what you got too?

Answer 8

2(x^2-7)+1
2(2^2-7)+1
2(4-7)+1
2(-3)+1
-6+1=-5
answer: -5

Answer 9

.......


How do you get -5?

Answer 10

Um..no I think that's wrong.

Answer 11

\((2x + 1)(x^2 - 7) = (2x^3 + x^2 - 14x - 7)(2) = 4x^3 + 2x^2 - 28x - 14\)

Answer 12

Is that one of your answer choices?

Answer 13

it was an essay question unfortunately

Answer 14

i'll put your one down too just in case :P thanks for your help @iGreen

Answer 15

No problem.