//Sample23_10.java
class Sample23_10 {

  /*素数*/
  static int[] primeNums = {2, 3, 5, 7, 11, 13};

  static double[] method_04(double a, double b, double c){
      /*各パートの計算*/
      double[] ans = {(2*a) , -b ,  (b*b-4*a*c)};
      return ans;
  }
  static double[] reduce(double[] ans){
      /*約分*/
      for(int i=0; i< primeNums.length; i++){
          if(ans[0] >= primeNums[i]){
            while(
              ans[0]%primeNums[i] == 0 &&
              ans[1]%primeNums[i] == 0 &&
              ans[2]%(primeNums[i]*primeNums[i]) == 0
              ){
                ans[0]/=primeNums[i];
                ans[1]/=primeNums[i];
                ans[2]/=(primeNums[i]*primeNums[i]);
            }
          }
      }
      return ans;
  }
  static void printAnswer(double[] ans){
      /*答えの表示*/
      double partA = ans[0];
      double partB = ans[1];
      double partC = ans[2];

      System.out.println("          " + partB + "  ±√( "+ partC +" )");
      System.out.println("    x = -------------------------");
      System.out.println("                " + partA);
  }
    public static void main(String[] args){
      /*設問の係数を二次元配列で準備*/
      int[][] coefficient ={
          {1,-8,9},
          {1,16,58},
          {1,-10,1},
          {1,28,142},
          {3,-30,51},
          {4,24,28},
          {1,-1,-1},
          {9,18,2},
          {2,-8,5},
          {4,12,7},
          {12,-48,39},
          {9,24,10},
          {6,-24,21},
          {8,20,-1},
          {9,-4,-1},
          {12,2,-7}
        };

        for(int i=0; i<coefficient.length; i++){

            /*一問ずつ抽出*/
            int[] line = coefficient[i]; //coefficient[i]は一次元配列
            int a = line[0];
            int b = line[1];
            int c = line[2];

            /*設問の表示*/
            System.out.println(
                (i+1) + ". " + (int)a + "xx+" + (int)b +"x+" +(int)c +"=0"
            );

            /*計算*/
            double[] ans = method_04(a, b, c);

            /*13までの約分*/
            ans = reduce(ans);

            /*答えの表示*/
            printAnswer(ans);
       }
    }
}