Mathematics for IGCSE & O level - Surds (Section 1 - No. 43)
Which of the following statements are correct?
√2 is a surd
√4 is a surd
Surds can be simplified using √a x √b = √ab
Rationalising the denominator results in surds.
Uitleg
√2 is a surd because its an irrational number. √4 is 2, so it's rational, so not a surd. √a x √b = √ab is a correct rule. Rationalising the denominator results in rational numbers.