Question 71559
If f(x) = x^2 +5, find f(a +h) -f(a) 
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Do each term separately, then subtract:
f(a+h) =  (a+h)^2+5 = a^2+2ah+h^2+5
f(a)   =  a^2+5
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Now subtract to get:
=2ah+h^2
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Cheers,
Stan H.