<PRE><B>Question 1044841</B>
f(x+h)=-3(x+h)+5/7(x+h)+4
That is -3x-3h+5/(7x+7h+4)
If they want f(x+h)-f(x)
-3x-3h+5/(7x+7h+4)-(-3x+5)/(7x+4); common denominator is (7x+7h+4)(7x+4)
The numerator is (-3x-3h+5)(7x+4)-(-3x+5)(7x+7h+4)
=-21x^2-12x-21xh-12h+35x+20-(-21x^2-21xh-12x+35x+35h+20)
=-21x^2-12x-21xh-12h+35x+20+21x^2+21xh+12x-35x-35h-20
=-47/[7(x+h)+4](7x+4)
=-47/(7x+4)^2 as h approaches 0.  This is the derivative.              
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