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If x + 2 is HCF of

it means that x = -2 is a root of the quadratic expressions and if you substitute x = -2 in the above expressions, their value is zero.

Add the two equations. we get

it means that x = -2 is a root of the quadratic expressions and if you substitute x = -2 in the above expressions, their value is zero.

Add the two equations. we get