#### SURDS

Surds is a numerical expression containing an irrational number.

Pure Surds – one which has one factor as a unit and the other factor as an irrational number.

Example:

{ √3, 3√7, … }

Mixed Surds – one which comprises of rational and irrational numbers.

Example:

{ 4 + √5, 3 + 3√6, 2 – √3, … }

### TYPES OF SURDS

A surd maybe quadratic, cubic, quartic and so on … depending upon the powers involved.

**1. Quadratic surd : √5 or 51/2**

**2. Cubic surd : 3√5 or 51/3**

**3. Quartic surd : 4√5 or 51/4**