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What is the correct factorised form of (4x^2+12x+9-y^2)?

Answer and explanation

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

The correct answer is A: \((2x+3-y)(2x+3+y)\). The first three terms form a perfect square because \(4x^2=(2x)^2\), \(9=3^2\), and \(12x=2(2x)(3)\). Thus \(4x^2+12x+9=(2x+3)^2\). The complete expression is \((2x+3)^2-y^2\). Using \(X^2-Y^2=(X-Y)(X+Y)\) gives \((2x+3-y)(2x+3+y)\). Option A is therefore correct, and expansion confirms it. Option B would come from \((2x-3)^2\), whose middle term is \(-12x\). Option C squares the wrong quantities and does not produce \(4x^2+12x+9\). Option D has \(y\) rather than \(y^2\) and is not the result of the difference-of-squares identity. Memory cue: check the middle term as twice the product of the two square roots.

Related tags

Perfect SquareDifference Of SquaresFactorisationExploring Algebraic IdentitiesMathematicsClass 9 Mcq

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