find the sum and product of the complex numbers 4-5i and -4+7i

finding sum and product of complex numbers
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sum...4-5i +(-4-7i) become(4-4)+(-5i -7i)...0-12i...-12i

produkt...(19,48i)

or size=51.62363799656123 & angel=68.4046895510323 deg
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