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Choose the factorised form of 4m² + 4mn + n².

Answer and explanation

Correct answer: (2m + n)²

The direct answer is A: (2m + n)². Use u² + 2uv + v² = (u + v)² with u = 2m and v = n. Then u² = 4m², 2uv = 2(2m)(n) = 4mn, and v² = n². Every term matches the given expression, so 4m² + 4mn + n² = (2m + n)². Option A expands correctly. Option B gives 4m² − 4mn + n², with the wrong sign in the middle. Option C gives 16m² + 8mn + n², so its first two coefficients are wrong. Option D expands to 4m² + 5mn + n², not the given middle coefficient. Memory cue: in a perfect-square trinomial, identify the square roots of the first and last terms, then verify that the middle term is twice their product.

Related tags

FactorisationPerfect Square TrinomialAlgebraic IdentitiesQuadratic ExpressionsExploring Algebraic IdentitiesMathematicsClass 9 Mcq

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