Determine the intervals where the function f (x) = - x-+2 x2-4 is decreasing and/or increasing.Determine the x values of the relative extrema of the function f (x) = x3 - 6x2 - 5. The find the values of the relative extrema.Determine the intervals where the function in concave up and concave down and any inflection points. g(x) = x2 + Blnfx + 1]