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What is the correct expansion of \((2x-3)^2\)?

Answer and explanation

Correct answer: \(4x^2-12x+9\)

Using \((a-b)^2=a^2-2ab+b^2\), take \(a=2x\) and \(b=3\). Then \((2x-3)^2=(2x)^2-2(2x)(3)+3^2=4x^2-12x+9\). Hence, option B is correct. Option A has an incorrect coefficient of the middle term, while option D has the wrong sign. Exam tip: the middle term in \((a-b)^2\) is always \(-2ab\).

Related tags

Algebraic IdentitiesBinomial SquareQuadratic ExpressionsPolynomial ExpansionExploring Algebraic IdentitiesMathematicsClass 9 Mcq

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