it is 3i and imaginary where i = square root of -1
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7.3
The square root of minus 8 is equal to the square root of 8 times the square root of minus 1, or 2.8284i.
x-7
9 square root 4 minus 12 square root 4 = -6
Square root (24) - square root (6) = 2.44948974