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Which of the following expressions can be written as a difference of two squares?

Answer and explanation

Correct answer: x^2 - 16

\(x^2-16=x^2-4^2\) is a difference of two perfect squares. Using \(a^2-b^2=(a-b)(a+b)\), it becomes \((x-4)(x+4)\). \(x^2+16\) is a sum of squares. Exam tip: check for square terms separated by a minus sign.

Related tags

Algebraic IdentitiesDifference Of SquaresFactorisationClass 9 MathematicsPerfect SquaresExploring Algebraic IdentitiesMathematicsClass 9 Mcq

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