Thursday, June 14, 2012

List of Irrational numbers



All Real numbers can be classified as rational and irrational numbers. Irrational numbers are . Irrational numbers are non –terminating non recurring decimals that cannot be expressed as fraction .

List of irrational numbers are as follow :
Irrational numbers
Irrational numbers
  1.  All  non perfect square roots are irrational numbers.Some example of irrational squareroots are √2 , √3 , √5  √7, √11, √13, √17 , √19 , √21…………….etc. as  √2=1.4141.4142135623…………………, √3=1.73205 08075 68877………….and so on ….All these squarroots have non-terminating  non-recurring decimals which can never be expressed as fractions.so they are irrational.
  2.  Like squareroots many cuberoots are also irrational . 3√ 3 , 3√ 5 , 3√ 7 , 3√ 14 etc  
  3.  Some natural constants  like ∏=3.14159 26535 89793…………………..and e=2.71828 18284 59045…………………………….., etc are irrationals
  4.  Sum of rational and irrationals are irrational .Let us take an example of 3 + √2  …which is irrational.
  5.  Difference of rational and irrationals are irrational . For example 2 - √5 .. is irrational.
  6.  Product of rational and irrational are irrational.For example 2 √7. are irrational
  7.  Quoitent of rational and irrational numbers are irrational √7/√5 are irrational
  8.  Negative of an irrational number is irrational. - √5 , - √7 , - √11… all are irrational number.
  9.  The product of non-zero rational number and an irrational number is an irrational number. Let us take an example of irrational number . List  two irrational number between . √2 and √7.In order to find  irrational number  we will first square of . √2 and . √7. (. √2) ² = 2 and (√7.) ²= 7 , As 2< 3< 5<7  it follows that √2< √3 < √5 < √7  , therefore √3 and √5 lies between √2 and √7 . Hence two irrational number between √2 and √7 are √3 and √5.

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