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Given that sqrt(5)=2. 236 approximately,...

Given that `sqrt(5)=2. 236` approximately, find to three places of decimals the value of `2/(sqrt(5))` .

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Solution
`2/(sqrt5)`
`2/(sqrt5)xx(sqrt5)/(sqrt5)`
`(2sqrt5)/(sqrt5 xxsqrt5)`
`(2sqrt5)/5`
`(2xx2.236)/5`
`(4.472)/5`
`0.894`
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  14. If x=(sqrt(3)+sqrt(2))/(sqrt(3)-sqrt(2)) and y=(sqrt(3)-sqrt(2))/(sqrt...

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  19. Simplify : (5+sqrt(5))(5-sqrt(5)) (ii) (3+2sqrt(2))(3-2sqrt(2))

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