Well, you have to divide by h before you take the limit as h goes to zero, right?
I'm stick on differentiating, from first principles, the following function:
f(x) = (3x-1)/(x+2)
I plug that into:
[f(a+h) - f(a)]/h
and I get:
7h/(x+h+2)(x+2)
But when I use the quotient rule to do it, I end up with:
7/(x+2)^2
I've been trying to get rid of that bothersome h, but I just haven't found a way to do it! I have a feeling that I'm overlooking something really simple. Any help appreciated.
No. That "h" in the numerator should not be there.
But when I use the quotient rule to do it, I end up with:
7/(x+2)^2
I've been trying to get rid of that bothersome h, but I just haven't found a way to do it! I have a feeling that I'm overlooking something really simple. Any help appreciated.