# The Solvr Sub-menu - HP 48gII User Manual

Graphing calculator.

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## The SOLVR sub-menu

The SOLVR sub-menu activates the soft-menu solver for the equation currently
stored in EQ. Some examples are shown next:
2
Example 1 - Solving the equation t
-5t = -4
For example, if you store the equation 't^2-5*t=-4' into EQ, and press @) S OLVR,
it will activate the following menu:
This result indicates that you can solve for a value of t for the equation listed at
the top of the display. If you try, for example, „[ t ], it will give you the
result t: 1., after briefly flashing the message "Solving for t." There is a
second root to this equation, which can be found by changing the value of t,
before solving for it again. Do the following: 10 [ t ], then press „[ t ].
The result is now, t: 4.0000000003. To verify this result, press the soft menu
key labeled @EXPR=, which evaluates the expression in EQ for the current value
of t. The results in this case are:
To exit the SOLVR environment, press J. The access to the SOLVE menu is
lost at this point, so you have to activate it once more as indicated earlier, to
continue with the exercises below.
2
Example 2 - Solving the equation Q = at
+bt
It is possible to store in EQ, an equation involving more than one variable,
say, 'Q = at^2 + bt'. In this case, after activating the SOLVE soft menu, and
pressing @) R OOT @) S OLVR, you will get the following screen:
Within this SOLVR environment you can provide values for any of the
variables listed by entering the value in the stack and pressing the
corresponding soft-menu keys. For example, say you enter the values Q = 14,
a = 2, and b = 3. You would use: 14 [ Q ], 2 [ a ], 3 [ b ].
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