Explain how to determine the leading coefficient of a polynomial function

Solve the equation x/4 - 5= -8 -27 -12 -7 12

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?

For the following geometric sequence, find the recursive formula. {-80, 20, -5, } i need : ')