Aspire Faculty ID #16300 · Topic: NIMCET 2010 · Just now
NIMCET 2010

The value of $X^4 + 9X^3 + 35X^2 - X + 4$ for $X = -5 + 2\sqrt{-4}$ is

Solution

$X = -5 + 4i$ Compute modulus: $|X|^2 = (-5)^2 + 4^2 = 25 + 16 = 41$ Because polynomial is symmetric to complex conjugates, evaluate: $X^4 + 9X^3 + 35X^2 - X + 4 = -160$

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