Question

Please tell the irrational number

Answer 1

Answer:

√81=9 and nine is not a rational number so, √81 is a irrational number

Answer 2

Option a: root 4/9 can also be written as root of (2/3)^2
Square and root will be cancelled and final answer will be 2/3 -> 2/3 is a rational number

Option b: root 12/ root 3 can also be written as root 3* root 4 / root 3
Root 3 on the top and bottom will be cancelled, leaving us with root 4, which is 2 -> 2 is a rational number

Option d: Root 81 is basically 9 -> 9 is a rational number

Option c: Root 5 can not be simplified into a rational number-> Root 5 is an irrational number

Therefore, your answer is option c: root 5
Hope this helps you!