Question

Prove that
$7 \ \sqrt{5}$
is Irrational..



Its urgent....

Answer 1

Let assume that 7√5 be rational .for a rational number the formula is a/b
so 7√5=a/b
√5=a/b
because 7 and five are integers so therefore a/7b is a rational number ,so √5 is a rational number this shows the fact of √5 is irrational number.