Not sure about "for a bi", but
sqrt(-245) = ± 15.652i where i is the imaginary square root of -1.
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245 * 245 = 60025
Complex numbers are numbers of the a + bi where a and b are real number and i is the imaginary square root of -1.
7 root 5
There are infinitely many of them. They include square root of (4.41) square root of (4.42) square root of (4.43) square root of (4.44) square root of (4.45) square root of (5.3) square root of (5.762) square root of (6) square root of (6.1) square root of (6.2)
A principal square root is any square root that's answer is positive, and a perfect square root is a square root that's answer is an integer.