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Factorise 4y² + 4y + 1.

Answer and explanation

Correct answer: (2y + 1)²

Answer: A, (2y + 1)². Compare the expression with p² + 2pq + q². The first term 4y² is (2y)², the last term 1 is 1², and twice their product is 2 × 2y × 1 = 4y, exactly the middle term. Hence 4y² + 4y + 1 = (2y + 1)². B is wrong because (2y − 1)² = 4y² − 4y + 1; its middle term is negative. C expands to 4y² + 4y + y + 1 = 4y² + 5y + 1, so it does not match. D is a difference of squares: (2y+1)(2y−1) = 4y² − 1, with no 4y term. The sign of the middle term is an important clue: a positive middle term requires the plus form here.

Related tags

Perfect-Square TrinomialFactorisationAlgebraic IdentitiesQuadratic ExpressionsExploring Algebraic IdentitiesMathematicsClass 9 Mcq

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