Tuesday, January 10, 2017

calculus - Find, from first principle, the derivative of:

Find, from first principle, the derivative of: log(ax+b)


My Attempt: f(x)=log(ax+b)

f(x+Δx)=log(ax+aΔx+b)
Now, f(x)=limΔx0f(x+Δx)f(x)Δx
=limΔx0log(ax+aΔx+b)log(ax+b)Δx
=limΔx0log(ax+aΔx+bax+b)Δx

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