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What is the value of \(14^2 + 15^2\)?

Answer and explanation

Correct answer: 421

Compute directly: \(14^2=196\) and \(15^2=225\), so \(196+225=421\). Alternate check: use identity \(a^2+b^2=(a+b)^2-2ab\); here \((14+15)^2-2\cdot14\cdot15=29^2-420=841-420=421\). The nearest wrong choice 411 can result from mistakenly taking \(15^2=215\) (giving 196+215=411). Exam tip: memorize common squares and use the identity to reduce calculation errors on paper.

Related tags

ExponentsNumber-SystemsSquaresArithmeticNumber SystemsMathematicsClass 9 Mcq

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