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What is the factorised form of 49x^2 + 14xy + y^2?

Answer and explanation

Correct answer: (7x + y)^2

The correct answer is A: (7x + y)^2. Use the identity (p + q)^2 = p^2 + 2pq + q^2. The first term 49x^2 is (7x)^2, and the last term y^2 is y^2. Now check the middle term: 2(7x)(y) = 14xy, which is positive and exactly matches the expression. Therefore 49x^2 + 14xy + y^2 = (7x + y)^2. Option B would expand to 49x^2 − 14xy + y^2, so its middle sign is wrong. Option C would have first term 2401x^2, not 49x^2, because (49x)^2 is much larger. Option D is the difference of squares and expands to (7x)^2 − y^2 = 49x^2 − y^2; it has no middle term. A helpful memory cue is: take the square roots of the first and last terms, then use the sign of the middle term between them.

Related tags

Perfect-SquareTwo-Variable-IdentityPositive-Middle-TermFactorisationExploring Algebraic IdentitiesMathematicsClass 9 Mcq

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