Timed question need help

If f(x)=x^3 and g(x)=2x+7 when g(x)=-5

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?

Write the rational number in lowest terms 99/-15