HP 40G manual About the Solve aplet

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Solve aplet

About the Solve aplet

The Solve aplet solves an equation or an expression for its unknown variable. 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 have the same value.

•An expression does not contain an equals sign. Its solution is a root, that is, a value for the unknown variable that makes the expression have a value of zero.

You can use the Solve aplet to solve an equation for any one of its variables.

When the Solve aplet is started, it opens in the Solve symbolic view.

•In Symbolic view, you specify the expression or equation to solve. You can define up to ten equations (or

expressions), named E0 to E9. Each equation can contain up to 27 real variables, named A to Z and θ.

•In Numeric view, you specify the values of the known variables, highlight the variable that you want to solve for, and press 62/9(a.

You can solve the equation as many times as you want, using new values for the knowns and highlighting a different unknown.

Note: It is not possible to solve for more than one variable at once. Simultaneous linear equations, for example, should be solved using matrices or graphs in the Function aplet.

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