You can write it as (18, 24) or 18 + 24 i
Or use -24 if appropriate.
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To take the square root of a complex number:* Write the original complex number in polar notation (absolute value and angle).* For the square root, the angle will be half the angle. The absolute value will be the square root of that of the original number.* There is a second square root: the same as above, but add 180 degrees (or pi, if using radians) to the angle.* If you wish, you can convert the result(s) back to rectangular coordinates, i.e., real number + imaginary number.Most scientific calculators have functions to convert from rectangular to polar and vice versa.
18 and 87/100
It is: 18 and 3/8
18/4 = 9/2 = 4½ or 4.5
One possible option is 18/10.