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What are the factors of \(4x^2-12x+9\)?

Answer and explanation

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

The direct answer is B: \((2x-3)^2\), or equivalently \((2x-3)(2x-3)\). Recognize the pattern \((P-Q)^2=P^2-2PQ+Q^2\). The first term \(4x^2\) is \((2x)^2\), and the last term \(9\) is \(3^2\). The middle term should be \(-2(2x)(3)=-12x\), exactly as given. Therefore \(4x^2-12x+9=(2x-3)^2\). A would produce \(+12x\), not \(-12x\). C expands to \(4x^2-13x+9\), so its middle coefficient is incorrect. D is the difference \((2x)^2-3^2=4x^2-9\), which has no middle term. The sign of the middle term is the key: a negative middle term requires subtraction inside the square.

Related tags

Perfect-Square TrinomialFactorisationAlgebraic IdentitiesQuadraticsExploring Algebraic IdentitiesMathematicsClass 9 Mcq

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