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What is obtained by simplifying ( (x+2y)^2-x^2-4y^2 )?

Answer and explanation

Correct answer: \(4xy\)

Using the identity \((a+b)^2=a^2+2ab+b^2\), with \(a=x\) and \(b=2y\), we get \((x+2y)^2=x^2+4xy+4y^2\). Subtracting \(x^2\) and \(4y^2\) leaves \(4xy\). \(2xy\) is incorrect because the middle term is \(2\times x\times 2y=4xy\). Exam tip: always calculate the middle term as \(2ab\) when expanding a binomial square.

Related tags

Algebraic IdentitiesBinomial SquarePolynomial SimplificationMiddle TermClass 9 MathematicsExploring Algebraic IdentitiesMathematicsClass 9 Mcq

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