Quote:
Originally posted by Down With The King:
x^3+2x^2+6x+3; 2i |
2i isn't a root of this equation.
x^3+2x^2+6x+3; 2i
(2i)³ = 2³i³ = 8(-1)i = -8i
2(2i)² = 2(2²)i² = 8(-1) = -8
6(2i) = 12i
3
-8i - 8 + 12i + 3 = -5 + 4i != 0.
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