A surd is a root of a number that is irrational. Examples: √2, √3, √5.
√4 = 2 is not a surd because it is rational.
Use √(ab) = √a × √b to take out square factors.
Example 1: √12 = √(4×3) = √4 × √3 = 2√3
Example 2: √72 = √(36×2) = 6√2
Example 3: √50 = √(25×2) = 5√2
Tip: Always look for the largest square factor.
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