106 數學函數

public class JPA106 {

    public static void main(String []argv){

System.out.printf("f(-3.2)=%.4f\n",f(-3.2));

System.out.printf("f(-2.1)=%.4f\n",f(-2.1));

System.out.printf("f(0)=%.4f\n",f(0));

System.out.printf("f(2.1)=%.4f\n",f(2.1));

    }

    public static double f(double x){

    return 3*(x*x*x)+2*x-1;

    }

}