1.

Simplify:(i) √(-16) + 3√(-25) + √(-36) - √(- 625)

Answer»

\(\sqrt{-16}+3\sqrt{-25}+\sqrt{-36}-\sqrt{-625}\)

\(\sqrt{16\times-1}+3\sqrt{25\times-1}+\sqrt{36\times-1}-\sqrt{625\times-1}\) 

= 4i + 3(5i) + 6i - 25i

= 25i - 25i

= 0



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