Show that root5 +root7 are irrational??
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70 मीटर लम्बी एक ट्रेन का वेग 75किमी/घण्टा हैं, तो वह 105मीटर लम्बे प्लेटफामृ को कितने समय में पार करेगी?
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Hence proved
let us assume that root7+root5 is rational
then root7+root5 =a/b where a and b are coprimes
then square on both sides
(root7+root5)^2 =(a/b)^2
(√7)^2 +(√5)^2 +2(√7)(√5)= (a/b)^2
7+2(√35)+5=(a/b)^2
2(√35)+12=(a/b)^2
√35=(a/b)^2-12
_________
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