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Complex Numbers

Evaluate : ...

Question

Evaluate : $\sqrt{- 16} + 3 \sqrt{- 25} + \sqrt{- 36} - \sqrt{- 625}$

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Solution

$\sqrt{- 16} + 3 \sqrt{- 25} + \sqrt{- 36} - \sqrt{- 625}$
$= 4 i + 15 i + 6 i - 25 i$
$= 25 i - 25 i$
$= 0$

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