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Question
Rationalise the denominator in the following and hence evaluate by taking `sqrt(2) = 1.414, sqrt(3) = 1.732` and `sqrt(5) = 2.236`, upto three places of decimal.
`(sqrt(10) - sqrt(5))/2`
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Solution
Let `E = (sqrt(10) - sqrt(5))/2`
= `(sqrt(5) sqrt(2) - sqrt(5))/2`
= `(sqrt(5)(sqrt(2) - 1))/2` ...`[∵ sqrt(10) = sqrt(2) sqrt(5)]`
= `(2.236(1.414 - 1))/2`
= 1.118 × 0.414
= 0.46285 ≅ 0.463
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