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What will be the factorised form of (x^2+2xy+y^2-4x-4y)?

Answer and explanation

Correct answer: ((x+y)(x+y-4))

The direct answer is option A: \(x+y)(x+y-4)\). Notice that the first three terms are \(x^2+2xy+y^2=(x+y)^2\). The remaining terms are \(-4x-4y=-4(x+y)\). Let \(t=x+y\). The expression becomes \(t^2-4t=t(t-4)\). Replacing \(t\) gives \( (x+y)(x+y-4)\). Option A matches this exact reasoning. Option B contains \(x-y\), but the original square has \(x+y\), so it changes the signs of the cross terms. Option C is \( (x+y-2)^2\), which also contains an extra constant \(4\) and is not equal. Option D has the wrong second factor and does not produce \(-4x-4y\). Memory cue: take a repeated binomial as one temporary variable.

Related tags

Substitution-MethodCommon-BinomialFactorisation

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