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All toolsScientific CalculatorEvaluate expressions with powers, roots, factorials, logarithms and trigonometry in degrees or radians, with memory and history.Graphing CalculatorPlot and compare functions, implicit equations and inequalities with zoom, pan, coordinate tracking and PNG export.Equation CalculatorSolve linear, quadratic and polynomial equations exactly, and other single-variable equations numerically, including complex roots.Derivative CalculatorDifferentiate functions symbolically — first, second and higher derivatives — with the rules used and a numerical verification.Integral CalculatorIndefinite integrals (antiderivatives) found symbolically and verified by differentiation before they are shown.Fraction CalculatorAdd, subtract, multiply, divide and simplify fractions and mixed numbers exactly, with step-by-step working, GCD and LCM.Matrix CalculatorMatrix addition, multiplication, transpose, determinant, inverse, rank, trace, row reduction, eigenvalues and eigenvectors.Statistics CalculatorMean, median, mode, range, variance, standard deviation, quartiles, percentiles, IQR and outliers for a data set — sample or population.
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Formula of the day
Formula libraryQuadratic formula
x = \frac{-b \pm \sqrt{b^2 - 4ac}}{2a}
Gives both roots of ax² + bx + c = 0. The expression under the root, the discriminant, tells you how many real roots there are.
Example: x² − 5x + 6 = 0 gives x = (5 ± 1)/2, so x = 2 or x = 3.
Open the Quadratic Equation SolverRecommended for you
Limit CalculatorCalculusFinite, one-sided and infinite limits, including 0/0 and ∞/∞ forms, estimated numerically and confirmed symbolically when possible.Triangle CalculatorGeometrySolve a triangle from SSS, SAS, ASA, AAS or RHS: sides, angles, area by Heron’s formula, heights, medians, bisectors and radii.Normal Distribution CalculatorStatistics & ProbabilityNormal probabilities below, above or between values, the density, and inverse lookups, with the shaded bell curve.System of Equations SolverAlgebraSolve systems of linear equations with exact Gauss–Jordan elimination; detects no-solution and infinitely-many-solution cases.Practice ModeLearnRandomised practice problems by topic and difficulty with instant answer checking, hints, explanations and score tracking.3D Surface PlotterGraphingPlot z = f(x, y) as an interactive 3D surface that you can rotate, zoom and pan, with adjustable ranges and colour maps.