कौन-सा विकल्प \(\sqrt{80}-\sqrt{45}+\sqrt{20}\) का सही सरल रूप है?
Which option is the correct simplified form of \(\sqrt{80}-\sqrt{45}+\sqrt{20}\)?
Explanation opens after your attempt
B. \(3\sqrt{5}\)
Concept
\(\sqrt{80}=4\sqrt{5}\), \(\sqrt{45}=3\sqrt{5}\), and \(\sqrt{20}=2\sqrt{5}\).
Why this answer is correct
\(4\sqrt{5}-3\sqrt{5}+2\sqrt{5}=3\sqrt{5}\), which is irrational.
Exam Tip
Handle the signs carefully when three terms are involved. चरण 1: \(\sqrt{80}=4\sqrt{5}\), \(\sqrt{45}=3\sqrt{5}\), और \(\sqrt{20}=2\sqrt{5}\)। चरण 2: \(4\sqrt{5}-3\sqrt{5}+2\sqrt{5}=3\sqrt{5}\), जो अपरिमेय है। चरण 3: तीन पदों में चिह्नों को ध्यान से संभालें।
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