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  1. float delta = b*b-4*a*c;
  2.         float topx_1;
  3.         float topx;
  4.         float topy;
  5.         float topy_1;
  6.  
  7.         if(b==0){
  8.             topx = c;
  9.             topy = a;
  10.         }
  11.         else if((c<0 && a<0) || (c>0 && a>0)) {
  12.             topx_1 = 2 * a;
  13.             topx = -(b / topx_1);
  14.             topy = -(delta / (4 * a));
  15.         }
  16.         else {
  17.             topx_1 = 2*a;
  18.             topx = -(b/topx_1);
  19.             topy_1 = -(delta/(4*a));
  20.             topy = topy_1/4;
  21.         }
  22.  
  23.         double[] pointsx = {-abs(4*topx), -abs(3*topx), -abs(2*topx), -abs(topx), abs(topx), abs(2*topx), abs(3*topx), abs(4*topx)};
  24.         double[] pointsy = {-abs(4*topy), -abs(3*topy), -abs(2*topy), -abs(topy), abs(topy), abs(2*topy), abs(3*topy), abs(topy)};
  25.         for(int i =0; i < pointsx.length; i++){
  26.             pointsx[i] *=100;
  27.             pointsx[i] = Math.round(pointsx[i]);
  28.             pointsx[i]/=100;
  29.         }
  30.         for(int i =0; i < pointsy.length; i++){
  31.             pointsy[i] *=100;
  32.             pointsy[i] = Math.round(pointsy[i]);
  33.             pointsy[i]/=100;
  34.         }
  35.  
  36.         Graph graph = new Graph.Builder()
  37.                 .addFunction(x -> a * x * x + b * x + c, Color.BLUE)
  38.                 .setWorldCoordinates(-abs(topx*5), abs(topx*5), -abs(5*topy), abs(5*topy))
  39.                 .setXTicks(pointsx)
  40.                 .setYTicks(pointsy)
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