How do you solve this?
4(x+5)(x−6)=0

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?

I'm confused on this could anyone me and show me what i need to do to solve it.

Find the nonpermissible replacement for binthis expression.b2/5b +5