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August 20, 2014

August 20, 2014

Posted by **just wondering** on Tuesday, February 9, 2010 at 7:42pm.

i have no clue what to do with the -3 in front of the f. please explain step by step as to how to do this question

the answer in the back is

-3x^2+24x-48

- math-functions starting -
**Reiny**, Tuesday, February 9, 2010 at 8:04pmThe problem probably said:

if f(x) = x^2 , find -3f(x-4)

f(x) = x^2

f(x-4) = (x-4)^2 = x^2 - 8x + 16

then -3f(x-4) = 3(x^2 - 8x + 16)

= -3x^2 + 24x - 48

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