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-a+ ai 5. (a) Let = = where a and b are positive real numbers. by/3 + bi Without using a calculator, determine z in

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-a+ ai 5. (a) Let = = where a and b are positive real numbers. by/3 + bi Without using a calculator, determine z in polar form. (b) Determine all solutions of the cubic equation 3- 112 + 150 = 0, given that = = 3 - 4i is one solution. (Show all working.)

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