Infinite differentiation

Calculus Level 2

Differentiate the following expression infinite times for x x : x 2015 . \large x^{2015}.


The answer is 0.

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2 solutions

Md Omur Faruque
Jul 11, 2015

Whatever the power of x x might be, if the power is a positive integer, after a certain times of differentiation the output will be 0 0 .

Notice that, after each differentiation power of x is becoming less by 1. In this case the 2015th derivative will have a constant multiplied by x 0 = 1 x^{0}=1 and the result will be a constant.

Now, what do we get when we differentiate a constant?

\rightarrow Of course, 0 \color{#69047E} {\boxed{0}} .

For example, let's try this with x 3 x^3 :

d d x x 3 = 3 x 2 \frac{d} {dx} x^{3}=3x^{2} d d x 3 x 2 = 3 × 2 x = 6 x \Rightarrow \frac{d} {dx} 3x^2= 3\times2x=6x d d x 6 x = 6 \Rightarrow \frac{d} {dx} 6x=6 d d x 6 = 0 \Rightarrow \frac{d} {dx}6=\color{#69047E} {\boxed{0}}

Hey, d 6 d x = 6 x ? \displaystyle \text { Hey, } \frac { d6 } { dx } = \frac { 6 } { x } \text { ? }

. . - 3 months, 2 weeks ago
Department 8
Jul 11, 2015

Consider:- d d x x 2015 \frac{d}{dx}x^{2015}

This gives 2015 x 2014 2015x^{2014}

Continuing this till some integer a a which ultimately gives 0

d d x x 2015 = 1 x x 2015 \displaystyle \frac { d } { dx } x ^ { 2015 } = \frac { 1 } { x } x ^ { 2015 }

. . - 3 months, 2 weeks ago

ur solution is wrong .you dont know how to differentiate.differentiate of x^{2015}=2015\times x^{2014}

Kaustubh Miglani - 5 years, 11 months ago

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