Surds - Rationalising the Denominator (AQA A-Level Mathematics): Flashcards

They are not in acceptable/simplified form

Simplified surd form

$\frac{\sqrt{b}}{\sqrt{b}}$

$a - b\sqrt{c}$

$\frac{a - b\sqrt{c}}{a - b\sqrt{c}}$

$a^2 - b$

Simplify any surds first

No, they are bad in the examiner's eyes

$7$

Difference of two squares