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`33-4sqrt(35)` का वर्गमूल क्या है?A. `+-(sqrt(7)+sqrt(5))`B. `+-(sqrt(7)+2sqrt(5))`C. `+-(sqrt(7)-2sqrt(5))`D. `+-(2sqrt(7)-sqrt(5))` |
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Answer» Correct Answer - D `33-4sqrt(35)` `=33-2xx2sqrt(35)` `=33-2xx2xxsqrt(7)xxsqrt(5)` `=28+5-2xx2sqrt(7)xxsqrt(5)` `=(2sqrt(7))^(2)+(sqrt(5))^(2)-2xx2sqrt(7)xxsqrt(5)` `=(2sqrt(7)-sqrt(5))^(2)` `sqrt(33-4sqrt(35))=+-sqrt((2sqrt(7)-sqrt(5))^(2))` `= +-(2sqrt(7)-sqrt(5))` |
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