# Please help me with this function.

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• Oct 9th 2012, 02:34 PM
wolfwood
Please help me with this function.
b(X) = X^2 + 3

find / simplify b(a+h) -b(a) / h

I thought I knew how to do this, but the function of X is confusing me since there is no X variable in the Find.
• Oct 9th 2012, 02:40 PM
skeeter
Re: Please help me with this function.
$\frac{(a+h)^2 + 3 - (a^2+3)}{h}$

expand the numerator and combine like terms, then factor ... you should get the $h$ in the denominator to divide out
• Oct 9th 2012, 02:47 PM
wolfwood
Re: Please help me with this function.
This helps a lot, thank you. I will be a returning customer =P