Question

is the square root of 18 a rational or irrational number?

Answer 1

Answer:

The square root of 18 is a rational number

Answer 2

Answer:

$\sqrt{18} = \sqrt{2 \times 3 \times 3 } = 3 \sqrt{2}$

Since any rational number multiplied with an irrational number is irrational, the square root of 18 is an irrational number.