Mathematics for IGCSE & O level - Surds (Section 2 - No. 16)

Which of the following is true regarding surds?

Surds are irrational numbers.

Surds can be simplified by using rules of algebra.

All square roots are surds.

Surds can be used to rationalize the denominator.

Surds are defined as irrational square roots. They can be simplified and used for rationalising the denominator.