I'm sorry, Kateln, I'm sort of in the fog on this one. I'm not sure what (fog)(x) means, but I'm going to interpret if as f[g(x)]
f of g of x
f[g(x)] = 8*[g(x)]^{2}  7*{g(x)]
= 8*(8x  4)^{2}  7*(8x  4)
= 512x^{2} 512x + 128  (56x  28)
= 512x^{2}  x(512 + 56) + 156
= 512x^{2}  568x + 156
= 128x2  142 + 39
I hope I've interpreted the problem correctly.
12/7/2013

William S.
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