document.write("What<br>");

var a = parseInt(prompt("Introduzca la A:"));

var b = parseInt(prompt("Introduzca la B:"));

var c = parseInt(prompt("Introduzca la C:"));

var d = Math.pow(b, 2) - 4 * a * c;

if (d >= 0) {
  //TODO: Remember math class
  var x1 = -b + Math.sqrt(d) / 2 * a;
  var x2 = -b - Math.sqrt(d) / 2 * a;
  document.write(`x1 = ${x1.toFixed(2)}<br>`);
  document.write(`x2 = ${x2.toFixed(2)}`);

} else {
  document.write(`Raíz imaginaria?`);
}

//2 25 2
document.write(`<br>d = ${d}`);
//alert(`a\na`);