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Which of the following expressions matches the identity for the square of a difference,

\((p-q)^2=p^2-2pq+q^2\)?

Answer and explanation

Correct answer: \(m^2-14m+49\)

In \(m^2-14m+49\), the first and last terms are \(m^2\) and \(7^2\), while the middle term is \(-2\times m\times7=-14m\). Hence it is \((m-7)^2\). Exam tip: check both the middle-term sign and twice-product condition.

Related tags

Algebraic IdentitiesSquare Of DifferencePerfect Square TrinomialClass 9 MathematicsPolynomial PatternsExploring Algebraic IdentitiesMathematicsClass 9 Mcq

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