1.

The conjugate surd of `(sqrt3 -5)` is _______

Answer» `(sqrt5 -5) (-sqrt3 -5) = - (sqrt3-5) (sqrt3+5)`
`= - {(sqrt3)^(2) - (5)^(2)} = - (3 - 25)`
`= - (-22) =22`, which is a rational number
Hence the conjugate surd of `(sqrt3 -5) " is " (sqrt3 + 5)`


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