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Restate the question: "What is the value of radical (-12)?"

If this is not your question, please clarify and resubmit the question. :-)

If we are dealing with real numbers, then there is no answer: there is no real number whose square is a negative number.

If you are in the realm of imaginary and complex numbers, then you can say that:

rad(-12) = rad(-1*12) = rad(-1)*rad12 = i*rad12, where i is the number whose square is -1.

rad12 in turn can be written as rad(4*3) = 2rad3 =~ 3.5

The final answer can be written as 2irad3 or ~3.5i.

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Q: What is radical 12 negative?
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