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

Answer and explanation

Correct answer: \((2x+3)^2\)

The direct answer is A: \((2x+3)^2\). Begin by comparing the expression with the identity \((p+q)^2=p^2+2pq+q^2\). Here, \(4x^2=(2x)^2\) and \(9=3^2\). The middle term required for a perfect square is \(2(2x)(3)=12x\), which is exactly present. Therefore \(4x^2+12x+9=(2x+3)^2\). A is correct. B would have leading term \(16x^2\), not \(4x^2\). C gives a middle term \(-12x\), so its sign is wrong. D gives leading term \(x^2\), not \(4x^2\). Expanding the correct answer confirms it: \((2x+3)(2x+3)=4x^2+12x+9\). Memory cue: for a perfect-square trinomial, the middle term must be twice the product of the square roots of the first and last terms.

Related tags

Perfect-Square TrinomialFactorisationAlgebraic IdentitiesQuadratic ExpressionsExploring Algebraic IdentitiesMathematicsClass 9 Mcq

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