# Math Help - Need some basic differentiation help please

1. ## Need some basic differentiation help please

I apologize if I'm posting in the wrong section.

Question:

Find the gradient of the curve y = 5/x^4 at the point where x = 2.

2. 1. Find $\dfrac{dy}{dx}$

2. Put x = 2 in $\dfrac{dy}{dx}$

3. Simplify.

That's it

3. $y=5x^{-4}$
$\frac{dy}{dx}=5(-4)x^{-4-1}
= -20x^{-5}$

Now put x=2.