Which expression is equivalent to √ -80?
1 answer:
<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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