SOLUTION: If f(x)=x^2+2x+8, then what does f(x+9) equal?

Question 557537: If f(x)=x^2+2x+8, then what does f(x+9) equal?
Answer by jim_thompson5910(35256) (Show Source): You can put this solution on YOUR website!
Start with the given function

Replace EVERY 'x' with 'x+9'

FOIL

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Side note:

So

We are using the FOIL rule: First, Outer, Inner, Last and this means that we multiply the "first" terms, then the "outer" terms, then the "inner" terms, then finally the "last" terms. We then add up these products.

For a more in-depth look at expanding this, check out this link
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Distribute

Combine like terms.

So the answer is
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