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Choose the factorised form of (4x^2+4xy+y^2-6x-3y).

Answer and explanation

Correct answer: ((2x+y)(2x+y-3))

The direct answer is A: \((2x+y)(2x+y-3)\). Group the first three terms: \(4x^2+4xy+y^2=(2x+y)^2\). The remaining terms are \(-6x-3y=-3(2x+y)\). Taking the common factor \(2x+y\) gives \((2x+y)^2-3(2x+y)=(2x+y)(2x+y-3)\). Option A follows exactly. Option B changes the sign of \(y\), so its first product is not the given square. Option C is a square but expands differently and does not represent the expression. Option D gives different quadratic and linear terms. The useful method is to notice the same binomial in the square and in the remaining terms.

Related tags

SubstitutionCommon-BinomialFactorisation

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