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What is the factor form of ( 64x^2-1 )?

Answer and explanation

Correct answer: \((8x+1)(8x-1)\)

\(64x^2-1=(8x)^2-1^2\). Applying the identity \(a^2-b^2=(a+b)(a-b)\) gives \((8x+1)(8x-1)\). Option B would produce a middle term when expanded, so it is not correct. Exam tip: first rewrite both terms as perfect squares and then check for the difference-of-squares identity.

Related tags

FactorisationDifference Of SquaresAlgebraic IdentitiesPerfect SquaresClass 9 MathematicsExploring Algebraic IdentitiesMathematicsClass 9 Mcq

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