Find the interval in which the function `f(x) = 2x^3 - 21x^2+ 36x - 40` is increasing or decreasing.

Find the intervals in which the function f(x)=2x^3 -15x^2 + 36x + 1 is strictly increasing

Find the intervals on which the function f(x) = 2x^(3) - 15x^(2) + 36x + 6 is (a) increasing (b) decreasing.

Find the intervals in which the function f(x)= 2x^3-15x^2+36x+1 is increasing

Find the intervals in which the function f(x)=2x^3 -15x^2 + 36x + 1 is strictly decreasing

Find the intervals in which the functions: f(x) =x^3 + 2x^2 - 1 is strictly increasing and decreasing

Find the intervals in which the function f(x) = 2x^(3)-15x^(2)+36x + 6 is (i) increasing, (ii) decreasing.

Find the intervals in which the function f(x) = 2x^(3)-15x^(2)+36x + 6 is (i) increasing, (ii) decreasing.

Find the intervals in which the function f(x)=x^(3)-12x^(2)+36x+17 is (a) increasing,(b) decreasing.