Determine the intervals in which the following functions `f (x) = x^2 + 2x - 5` are strictly increasing or strictly decreasing.

Determine the intervals in which the following functions f (x)=x^2 - 4x + 6 are strictly increasing or strictly decreasing.

Determine the intervals in which the following functions f(x) = 7 + 12x - 3x^2 - 2x^3 are strictly increasing or strictly decreasing.

Determine the intervals in which the following functions f (x ) = 2x^3 - 15x^2 + 36x +1 are strictly increasing or strictly decreasing.

Find the interval in which the following function f(x) = x^3 + 2x^2 -1 is strictly decreasing.

Determine the intervals in which the following functions are strictly increasing or striclty decreasing. f(x) = 2x^3 - 12x^2 + 18 x + 5

Determine the intervals in which the following functions are strictly increasing or striclty decreasing. f(x) = 2x^3 - 9x^2 + 12x + 15

Determine the intervals in which the following functions are strictly increasing or striclty decreasing. f(x) = -2x^3 - 9x^2 - 12 x +1

Determine the intervals in which the following functions are strictly increasing or striclty decreasing. f(x) = 2x^3 - 15x^2 + 36 x + 17