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Which of the following expressions is a factor of \(a^4-b^4\)?

Answer and explanation

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

Write \(a^4-b^4\) as a difference of squares: \((a^2)^2-(b^2)^2=(a^2-b^2)(a^2+b^2)\). Hence \(a^2+b^2\) is a factor. Exam tip: for fourth powers, first check whether they can be treated as squares.

Related tags

Algebraic IdentitiesDifference Of SquaresFactorisationPolynomialsClass 9 MathematicsExploring Algebraic IdentitiesMathematicsClass 9 Mcq

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