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3 years ago

Which expression is equivalent to √ -80?

Mathematics

1 answer:

oksian1 [2.3K]3 years ago

3 0

<h3>Answer: Choice C</h3><h3>which is the expression 4*sqrt(5)*i, where i = sqrt(-1)</h3>

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Explanation:

Factor -80 in such a way where we pull out -1 and we also factor out the largest perfect square possible. In this case, it would be 16 because 80 = 16*5. So this means -80 = -1*16*5 which leads to...

sqrt(-80) = sqrt(-1*16*5)

sqrt(-80) = sqrt(-1)*sqrt(16)*sqrt(5)

sqrt(-80) = i*4*sqrt(5)

sqrt(-80) = 4i*sqrt(5)

sqrt(-80) = 4*sqrt(5)*i

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