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SolveEquation

FilledSmallSquare SolveEquation[eqns, vars] attempts to solve an equation or set of equations for the variables vars.

FilledSmallSquare Equations are given in the form lhs == rhs.

FilledSmallSquare Simultaneous equations can be combined either in a list or with &&.

FilledSmallSquare A single variable or a list of variables can be specified.

FilledSmallSquare SolveEquation[eqns] tries to solve for all variables in eqns.

FilledSmallSquare Example: SolveEquation[3 x + 9 == 0, x] LongRightArrow

FilledSmallSquare When there are several solutions, SolveEquation gives a list of them.

FilledSmallSquare When a particular root has multiplicity greater than one, SolveEquation gives several copies of the corresponding solution.

FilledSmallSquare SolveEquation deals primarily with linear and polynomial equations.

FilledSmallSquare SolveEquation gives generic solutions only. It discards solutions that are valid only when the parameters satisfy special conditions.

FilledSmallSquare SolveEquation gives {} if there are no possible solutions to the equations.

FilledSmallSquare See also: LocateRoot, SolveODE.

Examples

Using InstantCalculators

Here are the InstantCalculators for the SolveEquation function. Enter the parameters for your calculation and click Calculate to see the result.

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Entering Commands Directly

You can paste a template for this command via the Text Input button on the SolveEquation Function Controller.

Polynomial equations in one variable

These are standard formulas for the solutions of normalized quadratic and cubic equations.

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Here are two simple equations of higher degree with solutions in terms of powers. They can be rewritten in terms of trigonometric functions that sometimes automatically reduce to radicals.

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Polynomial equations in more than one variable

Here we solve for x and y.

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Clear the variable definition.

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Here we solve two simultaneous algebraic equations.

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Here are three simultaneous algebraic equations; y and z must be paired up correctly with x.

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Here SolveEquation returns an empty list, indicating no solution. Every potential solution forces an equation in the parameter z alone, so there are no generic solutions.

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We can get solutions by solving for z as well as x and y.

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Equations involving trigonometric or hyperbolic functions, or their inverses

This is an example using the trigonometric function cosine.

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Equations involving exponentials and logarithms

This uses the ordinary mathematical notation for Exp.

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