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What is the factor form of ( 9a^2-25b^2 )?

Answer and explanation

Correct answer: \((3a+5b)(3a-5b)\)

The expression is a difference of two perfect squares: \(9a^2=(3a)^2\) and \(25b^2=(5b)^2\). Using \(x^2-y^2=(x+y)(x-y)\), we get \(9a^2-25b^2=(3a+5b)(3a-5b)\). Option B is incorrect because squaring it also produces a middle term, \(-30ab\). Exam tip: first rewrite each term as a perfect square, then apply the difference-of-squares identity.

Related tags

FactorisationDifference Of SquaresAlgebraic IdentitiesPerfect SquaresClass 9 MathematicsExploring Algebraic IdentitiesMathematicsClass 9 Mcq

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