# Rate of Change

• February 5th 2010, 12:44 PM
discobob
Rate of Change
Hey, I'm doing some homework and I didn't understand this problem. It's a little confusing.

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

The first thing I did was integrate the function. But I'm not sure what to do next.
• February 5th 2010, 01:02 PM
VonNemo19
Quote:

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

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

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

They have told you (a bit ambiguously I might add) that $y'=4$ at $x=x_0$. So find $x_0$
• February 5th 2010, 02:04 PM
discobob
wow, that's it? It was written a bit confusingly. Thank you very much for the help.
• February 5th 2010, 02:11 PM
VonNemo19
Quote:

Originally Posted by discobob
wow, that's it? It was written a bit confusingly. Thank you very much for the help.

So, what do you have for $x_0$?