Which of the following is equivalent to the expression below?

asked Apr 13, 2019 79.8k views

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3 votes

$i=√(-1)\\\\\\sqrt{a\cdot b}=√(a)\cdot√(b)$

$√(-20)=√(-1\cdot4\cdot5)=√(-1)\cdot\sqrt4\cdot\sqrt5=i\cdot2\sqrt5\\\\Answer:\ \boxed{A.\ 2i\sqrt5}$

Chris Visser answered Apr 18, 2019

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