Homework Help: Pre-Calc

Posted by Cade on Sunday, October 2, 2011 at 5:03pm.

Evaluate the indicated function for
f(x)=x^2-8 and g(x)=x-4
(fg)(3)
Am i doing this right?
((x^2)-8))(x-4)
=(x^3 -12+32)(3)

Answer=3x^3 -36+96
Thanks!

Pre-Calc - bobpursley, Sunday, October 2, 2011 at 5:08pm
it depends on what you mean by (fg)(3)

What I think you are working with is a convolutions

f convolution g of 3 is
= (x-4)^2 - 8 when x=3) or
= 1-8 or -7

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