Quadratic Formula Calculator
x2 + x + = 0
⇒
x ∈ {, }
Welcome to the free online quadratic formula calculator. It uses JavaScript to calculate the root of a quadratic equation in the form ax2 + bx + c. Enter the values of a, b, and c, and the values of x will automatically be calculated using the quadratic formula, x = (-b ± √(b2 - 4ac)) ÷ 2a.
Note: this calculator will also solve quadratic equations with complex roots, so if you don't know what those are, ignore the answers with the letter "i" in them. High school teachers may have told you that taking the square root of a negative number is impossible, but they are either wrong or lying.
