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Which of the following expressions can be written as a product of two binomials using the identity for the difference of two squares?

Answer and explanation

Correct answer: \(x^2 - 49\)

\(x^2-49=x^2-7^2\) is a difference of two squares. Using \(a^2-b^2=(a-b)(a+b)\), it becomes \((x-7)(x+7)\). \(x^2+49\) is a sum of squares, not this identity. Exam tip: check for two perfect squares separated by a minus sign.

Related tags

Algebraic IdentitiesDifference Of SquaresFactorisationBinomialsClass 9 MathematicsExploring Algebraic IdentitiesMathematicsClass 9 Mcq

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