The set of all real numbers $x$ satisfying the inequality $x ^ { 3 } ( x + 1 ) ( x - 2 ) \geq 0$ is (A) the interval $[ 2 , \infty )$ (B) the interval $[ 0 , \infty )$ (C) the interval $[ - 1 , \infty )$ (D) none of the above
(D) Check for 'test points'.
The set of all real numbers $x$ satisfying the inequality $x ^ { 3 } ( x + 1 ) ( x - 2 ) \geq 0$ is\\
(A) the interval $[ 2 , \infty )$\\
(B) the interval $[ 0 , \infty )$\\
(C) the interval $[ - 1 , \infty )$\\
(D) none of the above