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Write ( x^2-49 ) in factors.

Answer and explanation

Correct answer: \((x-7)(x+7)\)

Use the identity \(a^2-b^2=(a-b)(a+b)\). Since \(49=7^2\), \(x^2-49=x^2-7^2=(x-7)(x+7)\). The close distractor \((x-7)^2\) expands to \(x^2-14x+49\), so it is not equal to the given expression. Exam tip: find the square root of the constant term before applying the difference-of-squares identity.

Related tags

FactorisationDifference Of SquaresAlgebraic IdentitiesClass 9 MathematicsPolynomialsExploring Algebraic IdentitiesMathematicsClass 9 Mcq

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