Solve App; About The Solve App - HP 39gII User Manual

Solve app

About the Solve app

NOTE
Solve app
The Solve app solves an equation or an expression for
one of its unknown variables. You define an equation or
expression in the Symbolic view, then supply values for all
the variables except one in the Numeric view. Solve
works only with real numbers.
Note the differences between an equation and an
expression:
An equation contains an equals sign. Its solution is a
•
value for the unknown variable that makes both sides
of the equation have the same value.
An expression does not contain an equals sign. Its
•
solution is a root, a value for the unknown variable
that makes the expression have a value of zero.
You can use the Solve app to solve an equation for any
one of its variables. In addition, if the equation or
expression is a polynomial in a single variable and there
is more than one solution for the variable, then
appears in the menu. Pressing this menu key will display
a list of all real solutions for the variable.
You can solve the equation as many times as you want,
using new values for the knowns and highlighting a
different unknown for which to solve.
You can only have one equation checked at a time. Other
apps can have multiple equations checked, but not the
Solve app. Once solved, the app carries the values of
solved variables into new equations, and you can solve
for new variables using the recently calculated values. It
is not possible to solve for more than one variable at
once. Simultaneous linear equations, for example, should
be solved using the Linear Solver app, matrices or graphs
in the Function app.
4
61