what is a derivitive?

And how do you get it (f(x)=2x) from f(x)=x^2-3?

3 answers

Hmmmm. YOu must be only in limits,not yet to derivatives.

If there is a function f(x), the derivative is defined as...

lim d>>0 of (f(x+d) -f(x))/d
Oh! I've seen that equation we just don't call it a derivative. thanks!
This is ahead of your class..
http://en.wikipedia.org/wiki/Derivative

One thing I strongly recommend to you, is go visit the nearest college bookstore, or Barnes Noble, and take a close look at this: Schaum's Outline Series, Calculus.

It is inexpensive, chock full of example problems worked, and is easy to read. Don't hesitate...ask mom for an early birthday present of it.