please help, business calculus

37- find the intervals on which f(x) is increasing, the intervals on which f(x) is decreasing, and the local extrema.

f(x) = x^3 + 5x + 2

43- find the intervals on which f(x) is increasing, the intervals on which f(x) is decreasing, and the local extrema.

f(x) = x^4 + 4x^3 + 30