Functions with operations

DanaAJames

New member
Joined
Oct 29, 2014
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22
I am having issues with a functions problem. I have checked with other friends and they have gotten a different answer than me. I would like if you could check my work for me. I have done this problem 10 times now, and I have gotten the same answer each time. I would like to know what I am doing wrong.

g(x)=3x+5
f(x)=2x3-x
find 5g(-3)•3f(-3)

Here is what I have been doing:
5(3(-3)+5)•3(2(-33)--3)
5(-9+5)•3(2(-27)--3)
5(-4)•3(-54--3)
-20•3(-51)
-20•-153
3060

Did I do anything wrong? Thanks.
 
Everything looks fine to me. I worked the problem and got the same answer as you did, 3060. I'd say it's your friend(s) who have the wrong answer in this case. :)
 
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