Sketch a graph of a function f(x) that is differentiable and that satisfies the following conditions.

a) $\displaystyle f'(x) > 0$, when $\displaystyle x < -3$ and $\displaystyle x > 1$

I don't know what to do... I'm used to sketching functions with equation questions and not interval questions....

Please show me a step by step solution to this question, thanks