Find:
a) the slope of the tangent
b) the slope at
c) where the curve is differentiable
equation:
a)
Textbook Answer:
I get a negative answer instead of a positive answer, I can't seem to find my mistake, please help?
Are questions b and c correct?
b)
c)
(x at all real numbers)
Of course it is. has no trouble with x = 3: m = -1/36, a perfectly fine slope.
As both I and topsquark have already said, has trouble when x = -3. Because the denominator is equal to zero and hence the expression becomes undefined.
So clearly the curve is differentiable for all real values of x except x = -3.