Solve linear and quadratic equations with step-by-step results
Enter coefficients and click Calculate
Full-featured scientific calculator with trigonometry, logarithms, and history
Solve ratios, find missing values, and simplify ratios with visual breakdown
Add, subtract, multiply, and divide fractions with simplified results
Calculate percentages, percentage of a number, and percentage change
Equation Solver is a free online tool that solves linear equations (ax + b = 0) and quadratic equations (ax² + bx + c = 0) instantly. Enter the coefficients and get the solution with detailed results including the discriminant, roots (real or complex), and the vertex of the parabola for quadratic equations. A live preview shows your equation as you type. This tool is perfect for students learning algebra, teachers preparing examples, and anyone who needs to solve equations quickly. All calculations happen in your browser — no data is sent to any server.
Linear equation: ax + b = 0 x = -b / a Quadratic equation: ax² + bx + c = 0 Discriminant: D = b² - 4ac x = (-b ± sqrt(D)) / (2a) If D > 0: two distinct real roots If D = 0: one repeated real root If D < 0: two complex conjugate roots Vertex: (-b/(2a), -D/(4a))