How to solve difference quotient with functions?

For a function f, the formula f(x+h) -f(x)/h . This formula computes the slope of the secant line through two points on the graph of f. These are the points with x-coordinates x and x + h. The difference quotient is used in the definition the derivative.

 EX: f(x)=3(With a 2 expo.) -5x+4

f(x+h)-f(x)/h= 3(x+h) (2 expo)  -5(x+h)+4- (3(Two expo) -5x +4) 

=3(Expo 2) +6xh+3h(two exp) -5x-5h+4-3x(two expo) +5x-4

=6xh+3h(Two expo)-5h (Divide by:) H

=6x+3h-5

 I really hope i didn't confuse you.. I hope this helps... :)

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