Name: Anonymous 2009-03-18 19:04
f(x)=2x^2 - 1
I got to:
f'(x)=lim z->x (2z^2 - 2x^2 - 2)/(z-x)
Problem is, I can't seem to factor (z-x) out of the numerator. I was just wondering if I had missed something or done my derivative wrong. Any help would be much appreciated.
I got to:
f'(x)=lim z->x (2z^2 - 2x^2 - 2)/(z-x)
Problem is, I can't seem to factor (z-x) out of the numerator. I was just wondering if I had missed something or done my derivative wrong. Any help would be much appreciated.