If n (n ≠ 0) is the x 2 + m X-9 n = 0 root of the equation about X, find the value of M + n

Substituting n into the equation x2 + mx-9n = 0, N2 + mn-9n = 0n (M + N-9) = 0n = 0 or M + N-9 = 0 ｛ m + n = 9 ｛ m + n = 3

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