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To calculate (49^2), writing (49) in which form is simplest?

Answer and explanation

Correct answer: \(50-1\)

Writing \(49\) as \(50-1\) uses the nearby round number \(50\). Using \((a-b)^2=a^2-2ab+b^2\), \(49^2=(50-1)^2=2500-100+1=2401\). Although \(48+1\) is also a valid split, calculating \(48^2\) is less convenient than calculating \(50^2\). Exam tip: for quick squaring, express a number in terms of a nearby multiple of 10 or 100.

Related tags

Algebraic IdentitiesBinomial SquareMental CalculationSquares Of NumbersClass 9 MathematicsExploring Algebraic IdentitiesMathematicsClass 9 Mcq

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