Question

Which expression is equivalent to \sqrt(-80)?

Answer 1

√-80 can be factored out, to see which factors can be square rooted. A pair of factors would be 16 and -5, so that would be 4√-5. But, negative numbers cannot be inside a square root. So, √-1 is the same thing as i, or imaginary number. So, the expression equivalent to √-80 is 4i√5.
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Answer 2

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