Posted by **Urgent!!** on Saturday, April 17, 2010 at 8:37pm.

Find the composition.

If f(x) = x^2 + 12 and g(x) = x^2 - 5, find (g*f)(x)

- Math -
**Damon**, Saturday, April 17, 2010 at 8:45pm
f(x) = x^2 + 12 and g(x) = x^2 - 5, find (g*f)(x)

g(f) = (x^2 + 12)^2 - 5

= x^2 +24 x +144-5

= x^2 + 24 x +139

- Math -
**Reiny**, Saturday, April 17, 2010 at 8:46pm
(g*f)(x) or (g○f)(x)

=g(f(x))

= g(x^2+12)

= (x^2+12)^2 - 5

= x^4 + 24x^2 + 139

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