# Curve Sketching with Derivatives?

1. Homework Statement
I am given the following function:

$$f(x)=\frac{2x^2}{x-1}$$

The question asks to find the critical points and classify each using the second derivative.

2. Homework Equations

3. The Attempt at a Solution
I got the derivative of f(x) to be:
$$f'(x)=\frac{2x^2-4x}{(x-1)^2}$$
So the critical points are when x=0, x=1, and x=2.

Here's where I'm stuck. I don't know what it means when it asks to classify each using the second derivative.
If it helps, the second derivative is:

$$f''(x)=\frac{-8x^2+12x-4}{(x-1)^4}$$

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