On that question I found the stationary points, but I don't know how to do the first derivative test. I have the formula but my function give me headache to work with can someone help me.
Find any stationary points of the function g(x) defined in part (a)(ii), and use the First derivative Test to classify each stationary point as a local maximum or a local minimum of g(x).
square root 10+x^2
This equation has solutions x= 5 and x= 2. Thus the stationery points of f are at x= 5 and x= 2.
To classify the stationary point at x= 5, we choose test points xl= -1 and xr= 1, say. Then we have
f’(xl) = f’(-1)=