Q. The roots of the equation $x^{3} - 3x - 2 = 0$ are
A) -1, -1, 2
B) -1, 1, -2
C) -1, 2, -3
D) -1, -1, -2
Explanation
(a)
Given equation is
$x^{3} - 3x - 2 = 0\ \ \Rightarrow \ \ (x + 1)\left( x^{2} - x - 2 \right) = 0$
$\Rightarrow \ \ \ (x + 1)(x + 1)(x - 2) = 0$
$\Rightarrow \ \ x = - 1,\ - 1,\ 2$
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.