text: function solve(args) {
  
      var a = (+args[0]);
      var b = (+args[1]);
      var c = (+args[2]);
  
      var x = (b * b) - (4 * a * c);
      var root, firstRoot, secondRoot;
  
      if (x < 0) {
          console.log('no real roots');
      }
      else if (x === 0) {
          root = -b / (2 * a);
          console.log('x1=x2=' + root.toFixed(2));
      }
      else {
          firstRoot = ((-b + Math.sqrt(x)) / (2 * a));
          secondRoot = ((-b - Math.sqrt(x)) / (2 * a));
          console.log('x1=' + secondRootRoot.toFixed(2) + '; ' + 'x2=' + firstRoot.toFixed(2));
      }
  
  }
  