Question

How do you take the derivative of this??

f(x)=1/x^2

Answer 1

rewriting it as f(x)=x^(-2) makes it a piece of cake.

Answer 2

f'(x)=-2*x^(-3)

Answer 3

or:
f'(x)=-2/x^3

Answer 4

x^-1=1/x

So any time you see something written like that, you can just flip it around and give it a negative exponent. If you do, you can avoid using the quotient rule!

Answer 5

so how do u solve if f'(4)??

Answer 6

Thanks i got it just plug in 4