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The complex conjugate pair: 19.5 - 7.2629*i and 19.5 + 7.2629*i where i is the imaginary square root of -1. You add them together to get 19, multiply them together to get 433. An alternative answer, with real numbers, is 0.043884 and 432.956116 (approx).
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.
square root of 20 = square root of 4 * square root of 5. square root of 4 = 2, so your answer is 2 square root of 5.
Square root (24) - square root (6) = 2.44948974