Question

Prove that 4root 5 is irrational number
(Maths)

Answer 1

Answer:

4√5-9 => p/q

4√5 = p/q + 9

√5 = p/4q +9

p/4q+9 is a rational no.

but √5 is an irrational no.

so 4√5-9 is an irrational no.