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i = √-1
Z1 = -3 + i
Z2 = 5 - 2i
Z1*Z2 = (-3 + i)(5 - 2i) = (-15 + 6i + 5i - 2i²)
i² = (√-1)²
i² = -1
(-15 + 11i - 2(-1))
(-15 + 11i + 2)
(-13 + 11i)
Z1*Z2 = -13 + 11i