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Eamcet Mathematics
Algebra Theory of Equations

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Q.

If the equation x3 + 6x + 20 = 0 has one imaginary root 1+3i, then its real root is

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Correct choice: B

Explanation:

Given 1+3i is one root ⇒ 1-3i will also be a root.
Sum of the two roots = 1 + 3i + 1 - 3i = 2
S1 = Sum of all the roots = 0
∴ The third root = 0-2 = -2
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