Form a polynomial f(x) with real coefficients having the given degree and zeros. degree4 ; zeros: 3+2i; -1 multiplicity 2

Problem number 26 of the rhind papyrus says: find a quantity such that when it is added to of itself the result is a 15. the modern day equation that models this problem is x + x = 15. what is the solution to the equation? x = 10 x = 12 x = 15 x = 30