sqrt 31 29, Latest Questions, General Mathematics

Question:`(sqrt(31) - sqrt(29))/(sqrt(31) + sqrt(29)) = ?`

A `60 - 2 sqrt(899)` 
B `30 - sqrt(899)` 
C `30 + sqrt(899)` 
D `1/(30 - sqrt(899))`

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+ AnswerB

+ ExplanationGiven Exp.` ((sqrt(31) - sqrt(29))/((sqrt(31) + sqrt(29)) xx ((sqrt(31) - sqrt(29))/((sqrt(31) - sqrt(29))`

`= ((sqrt(31) - sqrt(29)^2)/((31 - 29))`

`= (31 + 29 - 2 sqrt(31) xx sqrt(29))/2`

`= 30 - sqrt(899)`

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