Linearization of ln(7x) at a=1/7

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Homework Statement


find the linearization of L(x) at a.
f(x)=ln7x, a=1/7


Homework Equations


f(a)+f'(a)(x-a)


The Attempt at a Solution



i got f(1/7)=0 and f'(1/7)=9.12
then shouldn't it be 0+.9.12(x-0)=9.12x?
 
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Not quite - Check your derivative again - if it helps, remember, ln(ax) = ln(a) + ln(x).
 

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