Ononot — Let P(x) = x^4 + ax^3 + bx^2 + cx + d be a polynomial with r

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Polynomialshard

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Let $P(x) = x^4 + ax^3 + bx^2 + cx + d$ be a polynomial with real coefficients. Given $P(1+i) = 0$ and $P(1-i) = 0$ , and the sum of the roots is $4$ , which of the following expressions represents the polynomial $P(x)$ ?