find f * g if f(x) = x^2-7 and g(x) = 2x+4

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- Aug 6th 2007, 04:27 PMaikenfancomposition
find f * g if f(x) = x^2-7 and g(x) = 2x+4

- Aug 6th 2007, 04:28 PMaikenfan
do i combine the two equations?

- Aug 6th 2007, 04:43 PMtopsquark
- Aug 6th 2007, 04:55 PMaikenfan
It is this:

(f \circ g)(x) = f(g(x)) = f(2x + 4) = (2x + 4)^2 - 7

but i am a bit confused - Aug 6th 2007, 05:38 PMKrizalid
I think aikenfan asked for $\displaystyle (f\circ{g})$

$\displaystyle (f\circ{g})=f(g(x))=(g(x))^2-7=(2x+4)^2-7$

Which is the same result of Dan