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What is the correct factor form of ( x^2-144 )?

Answer and explanation

Correct answer: \((x+12)(x-12)\)

Since \(144=12^2\), we have \(x^2-144=x^2-12^2\). Using \(a^2-b^2=(a+b)(a-b)\), its factor form is \((x+12)(x-12)\). The expansion of \((x-12)^2\) is \(x^2-24x+144\), so it is not correct. Exam tip: first check whether the constant term is a perfect square.

Related tags

FactorizationDifference Of SquaresAlgebraic IdentitiesPerfect SquaresClass 9 MathematicsExploring Algebraic IdentitiesMathematicsClass 9 Mcq

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