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 +1445
= 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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