## Calculus Tutorial

*The power rule*

#### Intro

The power rule is used to take derivatives of a variable raised to a power. When asked to take the derivative of say, x^2 (x squared), you bring the exponent down and multiply it by the existing coefficient, to become a coefficient of the variable, now you look back up at the exponent and subtract one. This leaves you with 2x^1, “two x to the first power”, or simply 2x. since you don’t need to state something raised to the first power.

#### Sample Problem

#### Solution

y=3x^4;

bring down the exponent and multiply by the existing coefficient;

12x^4;

now subtract one from the exponent;

y’=12x^3

the answer is y’=12x^3

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