Wilson and his family ate dinner at a restaurant. Their bill before tax came to $71.How much did dinner cost Wilson if he used a coupon for 10% off and a tax of 9% was charged after the coupon was applied? (to the nearest hundredth)

Write a polynomial function f of least degree that has rational coefficients, a leading coefficient of 1, and the given zeros. 3, 4+2i, 1+(sqrt)7 the answer is supposed to be: f(x)=x(^5)-13x(^4)+60x(^3)-82x(^2)- 144x+360 what am i doing wrong?