- #1
SithsNGiggles
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Homework Statement
Sketch and label on the same pair of axes the graphs of y=f(x) and y=f'(x) for ... c) f(x)=2x
Homework Equations
The Attempt at a Solution
f(x) = 2x
f'(x) = lim as h→0 (2x+h-2x)/h
= lim as h→0 (2x2h-2x)/h
= lim as h→0 2x(2h-1)/h
= lim as h→0 2x ∙ lim as h→0 (2h-1)/h
= 2x ∙ lim as h→0 (2h-1)/h
I know I have to show that the limit after 2x is equal to ln(2), but how do I do that using this definition?
Thanks.