2-8-43

Using the Action Menu

usolve

Function: Returns the solution of an equation or inequality.

Syntax: solve (Exp/Eq/Ineq [,variable] [ ) ]

•For this syntax, “Ineq” also includes the ≠ operator.

•“x” is the default when you omit “[,variable]”.

solve (Exp/Eq,variable[, value, lower limit, upper limit] [ ) ]

•This syntax does not support “Ineq”, but the ≠ operator is supported.

•“value” is an initially estimated value.

•This command is valid only for equations and ≠ expressions when “value” and the items following it are included. In that case, this command returns an approximate value.

•A true value is returned when you omit “value” and the items following it. When, however, a true value cannot be obtained, an approximate value is

returned for equations only based on the assumption that value = 0, lower limit = –∞, and upper limit =∞.

solve ({Exp-1/Eq-1, ..., Exp-N/Eq-N}, {variable-1, ..., variable-N} [ ) ]

• When “Exp” is the first argument, the equation Exp = 0 is presumed.

Example: To solve ax + b = 0 for x

Menu Item: [Action][Equation/Inequality][solve]

Example: To solve simultaneous linear equations 3x + 4y = 5, 2x – 3y = –8

Menu Item: [Action][Equation/Inequality][solve]

Note

For the solution, the solve function returns an expression or value for the expression (Exp/Eq) input as its argument. The message “More solutions may exist” will appear on the display when a value is returned as the solution, because there may be multiple solutions.

The solve function can return a maximum of 10 solutions in the case of values.

Example: To solve cos (x) = 0.5 for x (initial value: 0)

Menu Item: [Action][Equation/Inequality][solve]

(Angle unit setting: Deg)

20080201