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Which expression can be factorised as a product of conjugate binomials?

Answer and explanation

Correct answer: 49x² − (3y + 2)²

The correct answer is A. Conjugate binomials have the form (U − V) and (U + V); their product is U² − V². In A, 49x² = (7x)², so the expression is (7x)² − (3y + 2)². Applying the identity gives [(7x) − (3y + 2)][(7x) + (3y + 2)] = (7x − 3y − 2)(7x + 3y + 2). Option B is (7x + 3y + 2)², a square of a binomial. Option C is a sum of squares, not a difference. Option D is (7x − 3y − 2)². Neither square trinomial is a product of conjugates in the required direct form. Memory cue: conjugates differ only in the sign between the same two parts.

Related tags

Conjugate BinomialsDifference Of SquaresFactorisationAlgebraic IdentitiesExploring Algebraic IdentitiesMathematicsClass 9 Mcq

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