\( \sqrt{45}+\sqrt{80}-\sqrt{20} \) का सरल रूप क्या है?
What is the simplified form of \( \sqrt{45}+\sqrt{80}-\sqrt{20} \)?
Explanation opens after your attempt
Correct Answer
B. \(6\sqrt{5}\)
Concept
\( \sqrt{45}=3\sqrt{5} \), \( \sqrt{80}=4\sqrt{5} \), and \( \sqrt{20}=2\sqrt{5} \). So the value is \(3\sqrt{5}+4\sqrt{5}-2\sqrt{5}=5\sqrt{5}\).
Why this answer is correct
The correct answer is B. \(6\sqrt{5}\). \( \sqrt{45}=3\sqrt{5} \), \( \sqrt{80}=4\sqrt{5} \), and \( \sqrt{20}=2\sqrt{5} \). So the value is \(3\sqrt{5}+4\sqrt{5}-2\sqrt{5}=5\sqrt{5}\).
Exam Tip
\( \sqrt{45}=3\sqrt{5} \), \( \sqrt{80}=4\sqrt{5} \), और \( \sqrt{20}=2\sqrt{5} \)। इसलिए \(3\sqrt{5}+4\sqrt{5}-2\sqrt{5}=5\sqrt{5}\) नहीं बल्कि \(5\sqrt{5}\) होगा।
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