Please help.

package com.codegym.task.task06.task0609;
/*
Distance between two points
*/
public class Util {
public static double getDistance(int x1, int y1, int x2, int y2) {
double ans;
ans=Math.sqrt((Math.pow((x2-x1),2))-(Math.pow((y2-y1),2)));
return ans;
}
public static void main(String[] args) {
System.out.println(Util.getDistance(3,5,5,6));
}
}

+(Math.pow((y2-y1),2)));