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Choose the correct factorisation of (p² - q²).

Answer and explanation

Correct answer: (p - q)(p + q)

Answer: A, (p - q)(p + q). The expression p² - q² is a difference of two squares. Apply the identity a² - b² = (a - b)(a + b), taking a = p and b = q. This gives p² - q² = (p - q)(p + q). Option B expands to p² - 2pq + q², so it contains a middle term and has a positive q² term. Option C expands to p² + 2pq + q², which also has the wrong middle sign and a positive final term. Option D expands to p² - pq, so it does not reproduce the original expression. Multiplying option A shows the middle terms cancel: p² + pq - pq - q² = p² - q². Memory cue: a difference of squares always becomes difference times sum, not the square of a difference.

Related tags

FactorisationDifference Of SquaresAlgebraic IdentitiesBinomialsExploring Algebraic IdentitiesMathematicsClass 9 Mcq

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