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Which of the following expressions can be identified and factorised as a difference of two squares?

Answer and explanation

Correct answer: p²−q²

The direct answer is A: p²−q². This expression contains two perfect-square terms, p² and q², separated by a minus sign. It exactly matches the identity A²−B²=(A−B)(A+B), so p²−q²=(p−q)(p+q). Option B, p²+q², is a sum of squares and does not match this identity over ordinary real polynomial factorisation. Option C is a perfect-square trinomial because p²+2pq+q²=(p+q)². Option D is also a perfect-square trinomial because p²−2pq+q²=(p−q)². The important distinction is that the difference-of-squares form has only two square terms, while the perfect-square trinomials include a middle term ±2pq. Memory cue: minus between two squares gives conjugate factors, one with plus and one with minus.

Related tags

Algebraic IdentitiesFactorisationDifference Of SquaresPerfect Square TrinomialsClass 9 MathematicsExploring Algebraic IdentitiesMathematicsClass 9 Mcq

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