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What is ( (5a+2b)(5a-2b) ) equal to?

Answer and explanation

Correct answer: \(25a^2-4b^2\)

Use the identity \((x+y)(x-y)=x^2-y^2\), where \(x=5a\) and \(y=2b\). Therefore, \((5a+2b)(5a-2b)=(5a)^2-(2b)^2=25a^2-4b^2\). Option A incorrectly uses the sum of squares; the product of two binomials with opposite signs gives a difference of squares. Exam tip: whenever you see \((p+q)(p-q)\), apply \(p^2-q^2\) directly.

Related tags

Algebraic IdentitiesDifference Of SquaresBinomial ProductsClass 9 MathematicsExploring Algebraic IdentitiesMathematicsClass 9 Mcq

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