i am stuck on the following problem. here is a pic of the problem
f(x) = 5x-4
a = 3
f(a) = 5(3) - 4 = 15-4 = 11
f(x) - f(a) = 5x - 4 - 11 = 5x - 15 = 5(x-3)
[f(x) - f(a)]/(x-a) = (5x - 15)/(x-3) = [5(x-3)] / (x-3)
The x-3 terms cancel, and you're left with
[f(x) - f(a)]/(x-a) = 5
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