Question

Find all the zeroes of the polynomial 2x^3-x^2-5x-2,if the two of its zeroes are -1 and 2

Answer 1

$2 {x}^{3} - {x}^{2} - 5x - 2 \\ = (x + 1)(2x + 1)(x - 2)$
then x=-1,2 and -1/2