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What is the value of ( (5m+4n)(5m-4n) )?

Answer and explanation

Correct answer: \(25m^2-16n^2\)

This uses the identity \((a+b)(a-b)=a^2-b^2\). Here, \(a=5m\) and \(b=4n\), so \((5m+4n)(5m-4n)=(5m)^2-(4n)^2=25m^2-16n^2\). Option D resembles the expansion of \((5m-4n)^2\), but the given factors have opposite signs. Exam tip: in conjugate factors, the middle terms cancel out.

Related tags

Algebraic IdentitiesDifference Of SquaresBinomial ProductsClass 9 MathematicsPolynomial ExpressionsExploring Algebraic IdentitiesMathematicsClass 9 Mcq

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