power rule is very special rule in derivative. Which is derivative of x^{n }n is called power which will we anything number.

## what is power rule ?

Let’s assume some example to know how this derivate formula works for us.

What is derivative of x^{3}

So here we are going to apply derivate formula

Final answer is 3x^{2}

How to differentiating negative power

So this power rule allow us to solve problem if our expression should be like in 1/x^{n }.

So let’s assume we have 1/x^{2}

-2.x^{-3 }using power rule

-2/x^{3}

**How to remember this formula**

So if you are don’t want to remember this formula in math expression so here you just remember like that power comes in front and just subtract one in power so you will get your final answer.

Like x^{2} so just 2 comes down and we do minus in power and finally we get our answer which is 2x

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