It is neither because the square root of -18 is an imaginary number but the square root of 18 is irrational
The square root of 18 is an irrational number because it cannot be expressed as a fraction.
The square root of (any number that isn't a perfect square) is irrational.
It is irrational.
It is an irrational number which is 3 times square root 2
As √10 is irrational, 18 + √10 is irrational.
No. √324 = 18 = 18/1 = a rational number.
sqrt(18) = 3*sqrt(2) is an irrational number.
Yes because it can't be expressed as a fraction.
Yes. It would be 21/2 * 91/2, or "three root two". Root two is an irrational number, so it's products - such as root 18, will be as well.
Sqrt(18/2) =Sqrt(9) =3 which is rational.