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CBSE Maths for Class 10th Irrational Numbers from Real Numbers

CBSE Maths for Class 10th Irrational Numbers from  Real Numbers Irrational Numbers Theorem 4 Prove that  √ 11 is irrational. Proof:-let  √ 11  be rational and let its simplest form  a/b. Then  a  and  b  are integers having no common factor other than 1 and  b  is not equal 0 √11=a/b 11=a²/b²  on squaring both sides 11b²=a² 11 divide a² 11 divide b² 11 divide a 11 is prime and 11 divides a² Let  a  =11c for some positive integer  c Putting  a =11c in, we get 11b²=121c² b²=11c² 11 divide b² 11 divide b Thus 11 is a common factor of  a  and  b. Know more ...