Question

Prove that 4 + root 5 is irrational number

Answer 1

Answer:

4 root 5 is irrational number

Step-by-step explanation:

Let the rational number which is form a/b .a and b are integers.

since,root 5 is irrational number but a/4b is a rational number thus, 4root 5 is irrational number

Answer 2

Answer:

First take 4+√5 as rational number then by method of contradiction solve it.This is the only method made to learn is in class 10 .Might be other methods can be followed up in class 11 and 12.