Solve ax² + bx + c = 0 with the quadratic formula — real or complex roots, with every step shown.
Formula: x = (−b ± √(b² − 4ac)) ÷ 2a. The discriminant b² − 4ac tells you what to expect: positive → two real roots; zero → one repeated root; negative → two complex roots. The roots are shown rounded to 4 decimal places.