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What is the factorised form of (x^2+4y^2+4xy-9z^2)?

Answer and explanation

Correct answer: ((x+2y-3z)(x+2y+3z))

The direct answer is option A: \(x+2y-3z)(x+2y+3z)\). Rearrange the first three terms as \(x^2+4xy+4y^2=(x+2y)^2\). The last term is \(-9z^2=-(3z)^2\). Thus the expression is \( (x+2y)^2-(3z)^2\). Applying \(A^2-B^2=(A-B)(A+B)\) gives option A. Option B uses \(x-2y\), whose square has \(-4xy\), but the expression has \(+4xy\). Option C adds \(9z^2\) instead of subtracting it, so it has the wrong sign. Option D is not arranged as the difference-of-squares product and does not give the same factorisation. Memory cue: check the middle sign before choosing the perfect square.

Related tags

Hidden-SquareThree-VariablesFactorisation

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