# The Function f(x) is an Increasing Function in The Interval :

Consider the function

*f* (x) = -2x^{3} – 9x^{2} – 12x + 1

- The function
*f*(x) is an increasing function in the interval

(a) (-2, -1) (b) (-¥, -2) (c) (-1, 2) (d) (-1, ¥) - The function
*f*(x`) is a decreasing function in the interval

(a) (-2, -1) (b) (-¥, -2) only (c) (-1, ¥) (d) (-¥, -2) È (-1, ¥)