Thread: Cannot call method because it is non-static

I'm writing a program for my java class that has to solve quadratic equations. I have separate methods that calls the private variables a, b, and c. I also have separate methods for the discriminant and both the positive and negative roots. My code is as follows:

import java.util.Scanner;
public class QuadraticEquation {
	private double a;
	private double b;
	private double c;
	public static void main(String[] args){
		Scanner numberInput = new Scanner(System.in);
		System.out.print("Enter a, b, c: ");
		double a = numberInput.nextDouble();
		double b = numberInput.nextDouble();
		double c = numberInput.nextDouble();
		QuadraticEquation q1 = new QuadraticEquation(a, b, c);
		System.out.println(getRoot1());
 
	}//end main method
 
	public QuadraticEquation(double a, double b, double c){
		this.a = a;
		this.b = b;
		this.c = c;
	}//end constructor
 
	public double getDiscriminant(){
 
		double discriminant = Math.sqrt((getB()*getB()) - (4*getA()*getC()));
		return discriminant;
 
	}//end getDiscriminant()
 
	public double getA(){
		this.a = a;
		return this.a;
	}//end getA()
 
	public double getB(){
		this.b = b;
		return this.b;
	}//end getB()
 
	public double getC(){
		this.c = c;
		return this.c;
	}//end getC
 
	public double getRoot1(){
		double root1 = (-getB() + getDiscriminant()) / (2*a);
		return root1;
	}//end getRoot1()
 
	public double getRoot2(){
		double root2 = (-getB() - getDiscriminant()) / (2*a);
		return root2;
	}//end getRoot2()
}

My problem is that I get an error that says "Cannot make a static reference to the non-static method getRoot1() from the type QuadraticEquation". I know this means that it is not working because my method is not a static method but when I try to change it to a static method I get errors in all my other methods. I have no idea what to do any help would be appreciated.

First off I'd like to say thanks for the reply. I came to my senses about what you just posted before you posted it so I fixed that problem but now I have another one. In my assignment I have various conditions I have to meet, one of them being "if the discriminant < 0, output 'The Equation has no roots'". This is pretty straightforward but I'm not sure where I have to put that if statement. I'm guessing it has to be in both the getRoot methods but I have no idea which values to put into the statement.

ok thanks a lot for the help man I appreciate it.