Algebra: online algebra calculators

Polynomial Expressions

• Algebra — “Quickmath can expand, factor or simplify virtually any expression, cancel common factors within fractions, split fractions up into smaller (‘partial’) fractions and join two or more fractions together into a single fraction.”

Solving Equations

• Equations — “The equations section of QuickMath allows you to solve and plot virtually any equation or system of equations.”
• Solving for 2 Unknowns — Solve two equations in two unknowns.
• Solving for 3 Unknowns — Solve three equations in three unknowns.
• Linear Equation Solver — Solve three equations in three unknowns.
• 4 Unknown Calculator — Solve four equations in four unknowns.
• Quadratic Equation Calculator — Enter the parameters a, b, and c of the quadratic equation and solve for x.
• Cubic Equation Calculator — Solve an equation in the form AX^3 + BX^2 + CX + D = 0.
• Inequalities — “The inequalities section of QuickMath allows you to solve virtually any inequality or system of inequalities in a single variable.”

Matrix Algebra

• Matrices — “The matrices section of QuickMath allows you to perform arithmetic operations on matrices. Currently you can add or subtract matrices, multiply two matrices, multiply a matrix by a scalar and raise a matrix to any power.”
• Linear Algebra Matrix Calculators — Includes a (1) matrix calculator which “lets you calculate the determinant, adjoint, inverse, transpose, and more of a ‘n x n’ matrix”, (2) a linear algebra calculator which “has the ability to calculate the determinant, adjoint, and inverse of a ’3 x 3′ matrix”, and (3) a linear system of 3 equations which “can solve a linear system of 3 equations and 3 unknowns”.

Plotting Functions and Equations

• Graphs: Equations — Plot equation in terms of the variables x and y.
• Graphs: Inequalities — Plot polynomial inequality in terms of the variables x and y.
• Tracйs animйs — “Tracйs animйs allows you to plot curves and surfaces,in 2D or 3D, which zooms, deforms and/or rotates in all directions.”

Factorials

• Factorial Calculator — “Compute the factorial of an integer.”

Exponents and Logarithms

• Exponential Expression Calculator — “This JavaScript Calculator will find the product of an exponential expression (as in x raised to the power of y, where y is less than 600). It will handle positive and negative exponents and positive and negative bases.”
• A simple Logarithm Calculator — Enter two parameters in the equation b^x=y and compute the appropriate third value. Read the instructions to see how to use the calculator.

Resources and Interactive Exercises

• Practical Algebra Lessons — “The following lessons give practical tips, hints, and examples, and point out common mistakes.” Includes topics on numbers, beginning algebra, intermediate algebra, advanced algebra, solving word problems.
• Algebra Help and Tutorials — links to “Algebra tutorials, instructions, interactive lessons and information to help enhance algebraic learning and thinking.”
• Math2.org — Theorems, tables, identities, proofs and graphs for general math, algebra, geometry, trig, linear algebra, discrete math, statistics, calculus, and advanced topics.
• Geometry.net’s Mathematics Search Engines — “the best math search engines around the world”, contains a large list of math search engines for journals, subject matter, etc., with convenient search boxes for each.