यदि \(x=\sqrt{20}\) और \(y=\sqrt{45}\) तो (x+y) का सरल रूप क्या है?
If \(x=\sqrt{20}\) and \(y=\sqrt{45}\) then what is the simplified form of (x+y)?
Explanation opens after your attempt
A. \(7\sqrt{5}\)
Concept
\(\sqrt{20}=2\sqrt{5}\) and \(\sqrt{45}=3\sqrt{5}\), so the sum is \(5\sqrt{5}\). Simplify surds before adding.
Why this answer is correct
The correct answer is A. \(7\sqrt{5}\). \(\sqrt{20}=2\sqrt{5}\) and \(\sqrt{45}=3\sqrt{5}\), so the sum is \(5\sqrt{5}\). Simplify surds before adding.
Exam Tip
\(\sqrt{20}=2\sqrt{5}\) और \(\sqrt{45}=3\sqrt{5}\) इसलिए योग \(5\sqrt{5}\) नहीं बल्कि \(5\sqrt{5}\)? ध्यान दें सही जोड़ \(2\sqrt{5}+3\sqrt{5}=5\sqrt{5}\) है। परीक्षा में पहले सरल रूप निकालें।
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