
you can always multiply by 1 without changing the value. So, you want something that makes the denominator rational.
(3+√7)/(2√7) * (2+√7)/(2+√7)
= (3+√7)(2+√7) / (2√7)(2+√7)
= (13+5√7)/3
(23i)/(6+i) * (6i)/(6i)
= (23i)(6i) / (6+i)(6i)
= (1520i)/37posted by Steve
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