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Which is the factorised form of (m² + 2mn + n²)?

Answer and explanation

Correct answer: (m + n)²

The direct answer is D: (m + n)². Start with the identity a² + 2ab + b² = (a + b)². In the given expression, a = m and b = n. Therefore, m² + 2mn + n² = (m + n)². We can verify this by expanding: (m + n)² = (m + n)(m + n) = m² + mn + mn + n² = m² + 2mn + n². Option A, (m − n)², gives m² − 2mn + n², so its middle term has the wrong sign. Option B gives m² + 2mn, so it leaves out n². Option C is a difference of squares and gives m² − n², not the original trinomial. A useful memory cue is that a positive middle term 2mn indicates the plus-square identity; a negative middle term indicates the minus-square identity.

Related tags

Algebraic IdentitiesFactorisationPerfect Square TrinomialClass 9 MathematicsExploring Algebraic IdentitiesMathematicsClass 9 Mcq

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