Question

If two zeros x³ + x² − 5x − 5 are $\sqrt{5}\mathrm{and}-\sqrt{5}$, then its third zero is

(a) 1
(b) −1
(c) 2
(d) −2

Answer 1

Let and be the given zeros and be the third zero of x³ + x² − 5x − 5 = 0 then

By substitutingand in

Hence, the correct choice is