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

Answer and explanation

Correct answer: \(9p^2-16q^2\)

\(9p^2-16q^2=(3p)^2-(4q)^2\). Hence, it is the difference of the squares of two monomials and factors as \((3p+4q)(3p-4q)\). Option C is a perfect-square trinomial, \((3p-4q)^2\), not a difference of squares. Exam tip: check for two perfect-square terms separated by a minus sign.

Related tags

Quadratic ExpressionsAlgebraic IdentitiesDifference Of SquaresFactorisationClass 9 MathematicsExploring Algebraic IdentitiesMathematicsClass 9 Mcq

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