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Which number does \(\sqrt{7.84}\) represent on the number line?संख्या रेखा पर \(\sqrt{7.84}\) किस संख्या को निरूपित करता है?
Answer and explanationउत्तर और व्याख्या
Correct answer:सही उत्तर: \(2.8\)\(2.8\)
Since \(2.8^2=2.8\times2.8=7.84\), we have \(\sqrt{7.84}=2.8\). The nearby choices are incorrect because \(2.7^2=7.29\) and \(2.9^2=8.41\). In an exam, squaring the options is a quick way to verify a decimal square root.क्योंकि \(2.8^2=2.8\times2.8=7.84\), इसलिए \(\sqrt{7.84}=2.8\)। \(2.7^2=7.29\) और \(2.9^2=8.41\), अतः ये विकल्प सही नहीं हैं। परीक्षा में दशमलव वर्गमूल ज्ञात करने के लिए दिए गए विकल्पों का वर्ग करके जाँच करना उपयोगी है।
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