If n (n ≠ 0) is the root of the equation x2 + MX + 2n = 0, then the value of M + n is () A. 1B. 2C. -1D. -2

∵ n (n ≠ 0) is the root of the equation x2 + MX + 2n = 0 about X. substituting it into N 2 + Mn + 2n = 0, ∵ n ≠ 0, dividing both sides of the equation by N, we get n + m + 2 = 0, ∵ m + n = - 2

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