Solutions Command

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CAS Syntax

Solutions( <Equation> )
Solves a given equation for the main variable and returns a list of all solutions.
Example: Solutions(x^2 = 4x) yields {0, 4}, the solutions of x2 = 4x.
Solutions( <Equation>, <Variable> )
Solves an equation for a given unknown variable and returns a list of all solutions.
Example: Solutions(x * a^2 = 4a, a) yields {\mathrm{\mathsf{ \frac{4}{x},0 }}}, the solutions of xa2 = 4a.
Solutions( <List of Equations>, <List of Variables> )
Solves a set of equations for a given set of unknown variables and returns a list of all solutions.
Examples:
  • Solutions({x = 4 x + y , y + x = 2}, {x, y}) yields {{-1, 3}}, the sole solution of x = 4x + y and y + x = 2, displayed as \mathrm{\mathsf{ \begin{pmatrix}-1&3\end{pmatrix} }}.
  • Solutions({2a^2 + 5a + 3 = b, a + b = 3}, {a, b}) yields {{-3, 6}, {0, 3}}, displayed as \mathrm{\mathsf{ \begin{pmatrix}-3&6\\0&3\end{pmatrix} }}.
Note:
  • Sometimes you need to do some manipulation to allow the automatic solver to work, for example Solutions(TrigExpand(sin(5/4 π + x) - cos(x - 3/4 π) = sqrt(6) * cos(x) - sqrt(2)))
  • See also Solve Command.
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