Question

Prove that 3?5 is a irrational number

Answer 1

let  3root 5  be  rational = a/b  where  a and  b  are  integers  and  b not  equl  to zero

squaring  both  sides,    9*5 =45= a2/b2 ,    a2= 45  b2

again 45  is  not  a  squre,  hence  our  assumption  is  wrong