Question

May someone tell me I worked out this problem correctly
f(x) = 7x -2x ^2 where f(x-2)

1) f(x-2) =7(x-2)-2(x-2)^2
2) f(x-2) = 7x-14-2(x^2-4x+4)
3) f(x-2) = 7x - 14 -2x^2+8x-8
4) -x-22-2x^2

For some reason my solution doesn't look right to me...

Answer 1

F(x)=7x-2x^2
F(x-2)=7(x-2)-2(x-2)^2
F(x)=7x-14-2(x^2+4 -4x)
F(x)=7x-14-2x^2-8+8x

It's third option.

Answer 2

it seems right so far

Answer 3

it needs to be simplified though, which is where I got the -x-22-2x^2

Answer 4

7x - 14 -2x^2+8x-8

-2x^2 +x(8+7) -(14+8)

Answer 5

Sorry I failed...thought they're options..
-2x^2+15x-22

Answer 6

when you combined terms you did a nono :) they are spose to be LIKE terms

Answer 7

@Amistre: -2x^2+15x-22 can't this be the final term?

Answer 8

it can be, but it depends on how anal the grader is

Answer 9

the negation of it would seem more proper cause they dislike a negative leading coeff

Answer 10

the grader isn't too anal, just as long as I show my work and prove how I got to that solution. That is the originial solution I got, but then I starte second guessing myself

Answer 11

@amistre: how 'anal'?..