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Which can be written as the simplified factor form of ( 2x^2+12x+18 )?

Answer and explanation

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

Take 2 as a common factor: \(2x^2+12x+18=2(x^2+6x+9)\). Here, \(x^2+6x+9=x^2+2\cdot x\cdot3+3^2=(x+3)^2\). Therefore, the correct factor form is \(2(x+3)^2\). In contrast, \(2(x+6)^2\) would produce a middle term of \(24x\), so it is incorrect. Exam tip: for a perfect-square trinomial, check whether the middle term equals \(2ab\).

Related tags

Algebraic IdentitiesFactorisationPerfect Square TrinomialCommon FactorQuadratic ExpressionsExploring Algebraic IdentitiesMathematicsClass 9 Mcq

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