Function Notation

Hello,

I am college student. I am taking college Algebra and I need help with for the following.

Given f(x)=x^2+x, evaluate and simplify each of the following:

1. f(x-1)
2 .2f(x)


I would be greatly appreciated it if you help me.
What are your thoughts? What have you done so far? Please show us your work even if you feel that it is wrong so we may try to help you. You might also read
http://www.freemathhelp.com/forum/threads/78006-Read-Before-Posting

Hint: If f(x) = x2+x then f(blah) = blah2+blah
 
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