Hii please help i’ll give brainliest!!

What situation is an example of an observational study

Which of the following is true for the relation f(x)=2x^2+1

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?