Thread: Calculus: Differentiation

1. State the definition of the derivative, and give two interpretations of it.
2. Find the values of x at which the curve y= f(x) has a horizontal tangent.
If you can help me, I would gradually appreciate it

1) Google it. Think about the definition.

2) This question makes no sense. You get a horizontal tangent when . To work it out the function has to be known (I think).

I did find the first one but I am still lose on the second

There is some information missing.

The curve f(x) has horizontal tangent when its derivative is zero.