Question

The real root of the equation x3 – 7x2 + 15x – 25 = 0 is 5. What are the nonreal roots?

–4i, 4i
2 – 4i, 2 + 4i
1 + 2i, 1 – 2i
–16i, 16i

Answer 1

C

Explanation:

the other guy meant 1 + 2i, 1 – 2i

Answer 2

1±2i.

Explanation:

1. if to evaluate the expression given, it can be written

(x-5)(x²-2x+5)=0;

2. where the nonreal roots are 1±2i.