Question
Classify the number as rational or irrational: $2 - \sqrt {5}$
✓
Answer
$2 - \sqrt {5}$
$\because 2 $ is a rational number and$\sqrt {5}$ is an irrational number.
$(\because$ The difference of a rational number and an irrational number is irrational.$)$
$\therefore 2 - \sqrt {5}$ is an irrational number.
$\because 2 $ is a rational number and$\sqrt {5}$ is an irrational number.
$(\because$ The difference of a rational number and an irrational number is irrational.$)$
$\therefore 2 - \sqrt {5}$ is an irrational number.
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