Functions with operations

[DanaAJames]

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.

 

[ksdhart]

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.