Limit Problem 2

Calculus Level 4

lim x 1 3 x 1 ( ln ( x 5 ) + 1 x e ln ( x 6 ) ) = ? \large \lim _{ x\to 1 }{ \frac { 3 }{ x-1 } \left( \ln { { (x }^{ 5 }) } +\frac { 1 }{ x } -{ e }^{ \ln { ({ x }^{ 6 }) } }\right) } = \, ?


The answer is -6.

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1 solution

Chew-Seong Cheong
Dec 15, 2016

L = lim x 1 3 x 1 ( ln ( x 5 ) + 1 x e ln ( x 6 ) ) = lim x 1 3 ( 5 ln x + 1 x x 6 ) x 1 A 0/0 case, L’H o ˆ pital rule applies. = lim x 1 3 ( 5 x 1 x 2 6 x 5 ) 1 Differentiate up and down w.r.t. x = 3 ( 5 1 6 ) = 6 \begin{aligned} L & = \lim _{x \to 1} \frac 3{x-1}\left( \ln(x^5)+ \frac 1x - e^{\ln (x^6)} \right) \\ &= \lim _{x \to 1} \frac {3\left (5\ln x +\frac 1x-x^6\right) }{x-1} & \small \color{#3D99F6} \text {A 0/0 case, L'Hôpital rule applies.} \\ &= \lim _{x \to 1} \frac {3\left ( \frac 5x -\frac 1{x^2}-6x^5 \right) }{1} & \small \color{#3D99F6} \text {Differentiate up and down w.r.t. }x \\ &= 3(5-1-6) = \boxed{-6} \end{aligned}

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