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Which of the following expressions is in the form of a difference of two squares and can be factorised into a product of conjugate binomials?

Answer and explanation

Correct answer: \(49a^2-16b^2\)

\(49a^2-16b^2=(7a)^2-(4b)^2\). Using \(A^2-B^2=(A-B)(A+B)\), it becomes \((7a-4b)(7a+4b)\). Option C is a perfect square, not a difference. Exam tip: first identify whether both terms are squares.

Related tags

FactorisationAlgebraic IdentitiesDifference Of SquaresConjugate BinomialsClass 9 MathematicsExploring Algebraic IdentitiesMathematicsClass 9 Mcq

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