For each of the following functions on R to R, find points of relative extrema, the intervals

Question:

For each of the following functions on R to R, find points of relative extrema, the intervals on which the function is increasing, and those on which it is decreasing:
(a) f(x) := x2 - 3x + 5.
(b) g(x) := 3x - 4x2;
(c) h(x) := x3 - 3x - 4.
(d) k(x) := x4 + 2x2 - 4: