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Choose the correct factorised form of (x^4-2x^2y^2+y^4).

Answer and explanation

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

The expression is a perfect square because it matches \(u^2-2uv+v^2=(u-v)^2\), with \(u=x^2\) and \(v=y^2\). Thus it first becomes \((x^2-y^2)^2\). Since \(x^2-y^2=(x-y)(x+y)\), the complete factorisation is \((x-y)^2(x+y)^2\), so option B is correct.

The check is direct: \((x-y)^2(x+y)^2=[(x-y)(x+y)]^2=(x^2-y^2)^2\), which expands to \(x^4-2x^2y^2+y^4\). Option A is an equivalent intermediate form but is not fully factorised. Option C has the wrong sign in the middle term, and D omits one copy of each factor. Continue factoring whenever a difference of squares remains.

Related tags

Complete FactorisationPerfect SquareDifference Of Squares

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