y=x square root of 8-x^2

I did the derivative, -2x^2 square root of 8-x^2/2 square root 8-x^2

but I don't know if it's right.

Find the intervals on which the function is:

a) increasing?

b) decreasing?

c) concave up?

d) concave down?

e) local extreme values?

f) inflection points?