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Which of the following algebraic identities is used to factorise the expression \(49m^2-25n^2\)?

Answer and explanation

Correct answer: \(a^2-b^2=(a+b)(a-b)\)

Since \(49m^2=(7m)^2\) and \(25n^2=(5n)^2\), the expression is a difference of two squares. Therefore, use \(a^2-b^2=(a+b)(a-b)\). Exam tip: first check whether both terms are perfect squares.

Related tags

Algebraic IdentitiesDifference Of SquaresFactorisationClass 9 MathematicsPolynomialsExploring Algebraic IdentitiesMathematicsClass 9 Mcq

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