SOLUTION: If f(x)=5-x-x^2, find in simplest form: 2f(x)-f(-x) Thank you :)

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Question 387347: If f(x)=5-x-x^2, find in simplest form:
2f(x)-f(-x)
Thank you :)
Answer by stanbon(75887) About Me  (Show Source):
You can put this solution on YOUR website!
If f(x)=5-x-x^2,
then f(-x) = 5+x-x^2
--------------------------------
find in simplest form:
2f(x)-f(-x)
= 2(5-x-x^2)-(5+x-x^2)
= 10-2x-2x^2-5-x+x^2
= 5-3x-x^2
=================
cheers,
Stan H.