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Which algebraic identity is used to factorise a difference of two squares?

Answer and explanation

Correct answer: \(a^2-b^2=(a+b)(a-b)\)

A difference of squares, \(a^2-b^2\), factorises as \((a+b)(a-b)\). For \(x^2-25\), take \(a=x\) and \(b=5\) to get \((x+5)(x-5)\). Exam tip: check for subtraction between two perfect squares, not addition.

Related tags

Algebraic IdentitiesDifference Of SquaresFactorisationClass 9 MathematicsAlgebraExploring Algebraic IdentitiesMathematicsClass 9 Mcq

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