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The square root of minus 8 is equal to the square root of 8 times the square root of minus 1, or 2.8284i.
Four of anything minus one of the same thing always leaves three of them.
9 square root 4 minus 12 square root 4 = -6
It is +1
The square root of negative one is an imaginary number, signified by the italic lower-case i.