Using the graph, find the instantaneous rate of change at:

a) x = -2
b) x = -1
c) x = 3

I only need to know how to do one of them, so I can use the same formula/technique for b & c. The problem is that I can't post the graph on here so I just need the technique on how to find it.

I have to put this as geometer sketchpad because that's where the file comes from. I'm given a graph and 2 points which I can move... I'm not sure how to find instananeous rate though... Can anyone help me out?

Thanks

2. Originally Posted by agent2421

Using the graph, find the instantaneous rate of change at:

a) x = -2
b) x = -1
c) x = 3

I only need to know how to do one of them, so I can use the same formula/technique for b & c. The problem is that I can't post the graph on here so I just need the technique on how to find it.

I have to put this as geometer sketchpad because that's where the file comes from. I'm given a graph and 2 points which I can move... I'm not sure how to find instananeous rate though... Can anyone help me out?

Thanks
a) Draw the tangent at x = -2. Estimate its gradient.