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इन को समिश्र संख्या के रूप में लिखिए | ` 5 - 7 sqrt ( - 21 ) `

Answer» ` 5- 7 sqrt ( -21) = 5 - 7 sqrt (21 ( - 1 )) `
` = 5 - 7 sqrt (21 ) sqrt ( - 1 ) `
` = 5 - 7 sqrt (21 ) I" "[ because sqrt ( - 1 ) = i] `


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