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## Answers

therefore 3 + 2 root 5=a/b

root 5=a-3/2b

because a-3/2b is rational

therefore root 5 will also be rational

but we know that,

root 5 is irrational

that is our supposition is wrong

that is 3+2 root 5 is irrational.........

hope its help u.......

2root5=a/b-3

rearranging the equation 2root5=a-3b/b

root5=a-3b/2b

from the above we observe that a-3b/2b is rational number.so that root5is also rational.but root5 is not rational number.by this we can say 3+2root5 is irrational number