# Thread: Solving for the derivative

1. ## Solving for the derivative

Not sure what this is called, but basically trying to derive the actual derivative of the function $F(x)=3x^2 at (-2, 12)$

I would need to find $F(-2+h)$ which I got to as $3h^2-12h+12$ and then plugging it into the slope formula. This is where I'm getting confused.

What I did: $M=((3h^2-12h+12)-12)/h$

Is that correct? I know the derivative is $6x$ but I'm a little confused on getting to it on this question. Thanks!

2. You are right there. Do not stop.
Divide out the h. Then let $h\to 0$.

3. Originally Posted by Plato
You are right there. Do not stop.
Divide out the h. Then let $h\to 0$.
Ah, I see it now. Not sure why I was getting confused>.< Thanks a lot!