\(\sqrt{245}-\sqrt{180}+\sqrt{80}\) का सरल रूप क्या है?
What is the simplified form of \(\sqrt{245}-\sqrt{180}+\sqrt{80}\)?
Explanation opens after your attempt
C. \(7\sqrt{5}\)
Concept
\(\sqrt{245}=7\sqrt{5}\), \(\sqrt{180}=6\sqrt{5}\), and \(\sqrt{80}=4\sqrt{5}\). So the result is \(7\sqrt{5}-6\sqrt{5}+4\sqrt{5}=5\sqrt{5}\).
Why this answer is correct
The correct answer is C. \(7\sqrt{5}\). \(\sqrt{245}=7\sqrt{5}\), \(\sqrt{180}=6\sqrt{5}\), and \(\sqrt{80}=4\sqrt{5}\). So the result is \(7\sqrt{5}-6\sqrt{5}+4\sqrt{5}=5\sqrt{5}\).
Exam Tip
\(\sqrt{245}=7\sqrt{5}\), \(\sqrt{180}=6\sqrt{5}\) और \(\sqrt{80}=4\sqrt{5}\) है। इसलिए परिणाम \(5\sqrt{5}\) नहीं, \(7\sqrt{5}-6\sqrt{5}+4\sqrt{5}=5\sqrt{5}\) है।
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