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) = x^2 + 2x - 5 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.

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 are strictly increasing or striclty decreasing. f(x) = (4x^2+1)/x

Determine the intervals in which the following functions are strictly increasing or striclty decreasing. f(x) = 6-9x-x^2

Determine the intervals in which the following functions are strictly increasing or striclty decreasing. f(x) =x^8 + 6x^2

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

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

Determine the intervals in which the following functions are strictly increasing or striclty decreasing. f(x) = x^4 - 4x^3 + 4x^2 + 15

Determine the intervals in which the following functions are strictly increasing or striclty decreasing. f(x) = 20 - 9x + 6x^2 - x^3