Hey, I'm doing some homework and I didn't understand this problem. It's a little confusing.

Find $\displaystyle x_0 $ given that the rate of change of $\displaystyle y=2(x^2) + x -1 $ with respect to x at x= $\displaystyle x_0 $ is 4

The first thing I did was integrate the function. But I'm not sure what to do next.