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