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

Answer and explanation

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

First recognise the first three terms as a perfect square: \(x^2+4x+4=x^2+2\cdot x\cdot2+2^2=(x+2)^2\). The full expression is therefore \((x+2)^2-y^2\). This has the form \(A^2-B^2\), whose factorisation is \((A-B)(A+B)\). Taking \(A=x+2\) and \(B=y\) gives the complete factorisation.

Thus \(x^2+4x+4-y^2=(x+2-y)(x+2+y)\), so option A is correct. Option C is only an intermediate form and is not completely factorised. Option B changes the sign of the 4x term, so it represents a different expression. Option D incorrectly treats the whole expression as one square. Applying the two identities in sequence gives the answer safely.

Related tags

Quadratic ExpressionsGroupingDifference Of Squares

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