Homework Help: Pre-Cal

Posted by Hannah on Thursday, March 25, 2010 at 6:59pm.

Find (a) f X g , (b) g X f, and (c) f X f

f(x) = 3sqrt x-1 g(x) = x^3 + 1

For the f(x) the 3 is little above the sqrt sign.

my answers were:

(a) = 3sqrt x^4 -1

(b) = x^4 -1

(c) = 6sqrt x+1

These answers are wrong but I do not know how to do this

Pre-Cal - bobpursley, Thursday, March 25, 2010 at 7:09pm
f(x)= cubrt(x-1)
g(x)=x^3+1

f(g(x))= cubrt(x^3+1-1)=x
g(f(x)= f(x)^3+1=(cubrt(x-1)^3-1=x
f(f)= cubr(cubrt(x-1)-1) which might be simplified, but I dont see it now.

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