None. The square root of something will never be negative, so if *k* < 0, it can’t be all alone on the right side of that equation.

from Tumblr https://ift.tt/2Aah6qp

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None. The square root of something will never be negative, so if *k* < 0, it can’t be all alone on the right side of that equation.

from Tumblr https://ift.tt/2Aah6qp