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What is the simplified form of \( (2x+3y)^2+(2x-3y)^2-(8x^2) \)?

Answer and explanation

Correct answer: 18y²

Use the identity \((a+b)^2+(a-b)^2=2a^2+2b^2\). Here, \(a=2x\) and \(b=3y\), so \((2x+3y)^2+(2x-3y)^2=2(2x)^2+2(3y)^2=8x^2+18y^2\). Subtracting \(8x^2\) gives \(18y^2\). The \(12xy\) and \(24xy\) options are incorrect because the mixed \(xy\) terms cancel when the two squares are added. Exam tip: When \((a+b)^2\) and \((a-b)^2\) occur together, look for cancellation of the mixed terms.

Related tags

Algebraic IdentitiesBinomial SquaresSimplificationPolynomial ExpressionsClass 9 MathematicsExploring Algebraic IdentitiesMathematicsClass 9 Mcq

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