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coolbird143

  • 4 years ago

prove that value of sqrt 100 - sqrt 99 lies vetween 1/18 and 1/20

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  1. King
    • 4 years ago
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    we can say that sqrt99=3sqrt11=3*3.316=9.948 sqrt100=10 so 10-9.948=0.052 nw 1/18=0.55555... 1/20=0.5 so 0.052 lies between 0.55555... and 0.5 Thus,Proved!!!!!!

  2. experimentX
    • 4 years ago
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    10 - sqrt(100-1) => 10 - 10(1 - 1/100)^1/2 now let's expand (1 - 1/100)^1/2 using binomial theorem

  3. King
    • 4 years ago
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    Hello guest please sign in or sign up...Thnk u!!:D

  4. King
    • 4 years ago
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    @experimentX u can use binomial theorem but then hw do we know if coolbird143 knows this or not?

  5. experimentX
    • 4 years ago
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    (1-1/100)^1/2 = 1 -1/100x1/2-(1/100)^2x1/2 - ...

  6. experimentX
    • 4 years ago
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    well the best way is to use calculator ... :D

  7. King
    • 4 years ago
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    or use ure brains...using calculator is bad....

  8. experimentX
    • 4 years ago
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    10 - 10(1 - 1/100)^1/2 = 10 - 10 + 1/2*10/100 + 1/2*1/2*1/2*10/10000 + 1/2*1/2*3/2*1/6*10/1000000 => 1/2*10/100 + 1/2*1/2*1/2*10/10000 + 1/2*1/2*3/2*1/6*10/1000000 ... which is a converging series that lie between 1/18 and 1/20

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