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What is the factorized form of \(64x^2-81\)?

Answer and explanation

Correct answer: \((8x-9)(8x+9)\)

\(64x^2-81=(8x)^2-9^2\). Using the difference of squares identity \(a^2-b^2=(a-b)(a+b)\), we get \((8x-9)(8x+9)\). Options C and D are squares of binomials, which would contain a middle term, so they are not correct. Exam tip: Whenever two perfect squares are being subtracted, check for the difference of squares identity first.

Related tags

PolynomialsFactorizationDifference Of SquaresAlgebraic IdentitiesOperations On Real Numbers And The Laws Of ExponentsMathematicsClass 10 Mcq

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