Solving mathematical problems -- given that X-1 is the root of quadratic equation x2 + MX + n = 0, then the value of M2 + 2Mn + N2

It is known that x = 1 is the root of the quadratic equation x & # 178; + MX + n = 0
Then: 1 + m + n = 0
M+N=-1
M²+2MN+N²
=（M+N)²
=（-1）²=1

RELATED INFORMATIONS

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