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What is obtained by factorising \(a^2-2ab+b^2\)?

Answer and explanation

Correct answer: \((a-b)^2\)

The direct answer is A: \((a-b)^2\). This trinomial matches the identity \((u-v)^2=u^2-2uv+v^2\). Substitute \(u=a\) and \(v=b\): \((a-b)^2=a^2-2ab+b^2\). Hence the given expression factorises as \((a-b)^2\). Option B is wrong because \((a+b)^2=a^2+2ab+b^2\), whose middle term has a plus sign. Option C represents the difference of squares, \(a^2-b^2\), and does not contain the term \(-2ab\). Option D expands only to \(a^2-2ab\), so it misses the final term \(b^2\). Option A is verified by multiplying: \((a-b)(a-b)=a^2-ab-ab+b^2=a^2-2ab+b^2\). Common confusion: the sign inside the square controls the sign of the middle term; a minus inside produces a negative middle term.

Related tags

FactorisationPerfect-Square TrinomialAlgebraic IdentitiesClass 9 MathematicsExploring Algebraic IdentitiesMathematicsClass 9 Mcq

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