The function `f(x)=2x^3+9x^2+12x+20` is increasing in the interval

Find the intervals in which the function f(x) = 2x^3 + 9x^2 + 12x + 20 is increasing and decreasing.

The function f(x) =3+12x-9x^2+2x^3 is increasing in

Find the intervals in which the function f(x)=2x^(3) + 9x^2 + 12x + 20 is increasing

Find the intervals in which the function f(x)=2x^(3)+9x^(2)+12x+20 is increasing and decreasing.

Find the intervals in which the function f(x)=2x^3+9x^2+12 x+20 is (i) increasing (ii) decreasing

Find the intervals in which the function f(x)=2x^3+9x^2+12 x+20 is increasing and decreasing.

Find the intervals in which f(x) = 2x^(3) - 9x^(2) - 12 x -3 is increasing and the intervals in which f(x) is decreasing.

Find the intervals in which the function f(x)=2x^(3)+9x^(2)+12x+20 is (i) increasing (ii) decreasing

The interval on which the function f(x)=-2x^(3)-9x^(2)-12x+1 is increasing is :