Which expression uses the greatest common factor and the distributive property to rewrite the sum 60 + 24? 6(10+4) 10(6+4) 6(10+24) 12(5+2)

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?