Function Operations

Oct 2014
9
0
manchester
Hello, New Member here with a functions question.
I have some homework which is bothering me. I am not sure if I ammisunderstanding the question, or it's simpler than I thought. Here it is..........
f(x) = √(3x-3)
g(x) = x+7
Find:
fg(x),gf (x)
I am confused by the comma. Am I just being asked to calculate fg(x) and then gf(x), or does thecomma mean after calculating fg(x) and gf(x) I then have to calculate theirproduct?
I get fg(x) to be √((3x+7)-3), and
gf (x) to be (√(3x-3)) +7
Should I go on to multiply fg(x) and gf(x)? It's that comma that's confusing me.
Thanks
 
Oct 2012
751
212
Ireland
They are just asking you to calculate fg(x) and then gf(x)

There's a little mistake in your answer for fg(x)
 
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Oct 2014
9
0
manchester
Thank you so much. I found the mistake.

Seems like a stupid question now but at least it was an easy one