The perimeter of a triangle with the length of x, 5x, and 6x-3

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?

What is the distance from zero if a quadratic function has a line of symmetry at x=-3 and a zero at 4

Find measure angle 1 and measure angle 3 in the kite the diagram is not drawn on the scale