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Modulus = sqrt ( (-2)^2 + 8^2) = sqrt (68) = sqrt ( 4 * 17) = 2sqrt (17)
5 ( -2 + 8i) = -10 + 40i
Modulus = sqrt ( (-10)^2 + (40)^2 ) = sqrt [ 1700) = sqrt (100 * 17) = 10sqrt (17)
a positive real number
