Question

If one solution for x^3 + 2x^2 + x+ 2 is i, where i = radical -1, which of the following sets contains all other solutions?
(a) (-i)
(b) (-i, 2)
(c) (-i, -2)
(d) (2, -2)
(e) (2)

Answer 1

if \(i\) is a solution of your equation, then also \(-i\) is a solution

Answer 2

so we can eliminate (d) and (e)

Answer 3

and (a)

Answer 4

so u gotta choose between 2 or -2

Answer 5

yes but how

Answer 6

replace x=2 and x=-2 and see which one makes the polynomial zero.

Answer 7

got it. 2 doesn't work but -2 does, so the answer's (c)

Answer 8

thanks

Answer 9

u r w