15k^2 simplify exprexion

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

Question 5 of 10 2 points if a population is a sample of the population could be a. registered voters; all citizens o o b. baptists; all religious people o c. people who purchased shoes; all customers o d. the entire school faculty; math teachers

Factor the polynomial by its greatest common monomial factor.