exam Maths Puzzle Numerical Ability

(5-8i)-(2+9i)

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This problem is not from my textbook it is a worksheet problem.
Use Descartes�s rule of signs to discuss the possibilities for the roots of the equation.
4x3-9x2+2x+3=0 mr. b borrowed some money at 8% per year. after 27 months, he repaid the lender $354. how much had he borrowed?