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What should be added to `sqrt5 + sqrt3` so that the result is `2 sqrt5` ?

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What should be added to `sqrt5 + sqrt3` so that the result is `2 sqrt5` ?
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The required quantity `= 2 sqrt5 - (sqrt5 + sqrt3))`
`= 2 sqrt5- sqrt5 - sqrt3`
`= sqrt5 - sqrt3`
Hence `(sqrt5 - sqrt3)` should be added to `sqrt5 + sqrt3` to get `2 sqrt5`
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