50g

There are different ways to do your quadratic problem. A quick & dirty way is to use the DEF command.

enter 'PLUS(A,B,C)=(-B+(B^2-4*A*C)^.5)/2*A'
press the DEF key on your keyboard
You'll see PLUS as one of your menu keys.
enter e.g. 1 -2 -3 on the stack and press that PLUS soft key and the function will be evaluated.

You can do the same with the negative part...
'MINUS(A,B,C)=(-B-(B^2-4*A*C)^.5)/2*A'

--- On Wed, 7/16/08, Jose J Martinez <jose_j_martinez@...> wrote:

> From: Jose J Martinez <jose_j_martinez@...>
> Subject: [50g] HP 27S Solver & HP 50g Solver
> To: 50g@yahoogroups.com
> Date: Wednesday, July 16, 2008, 11:45 PM
> Back in the old days(early 90's) at San Diego State
> University I used
> an HP27S to get awesome grades in all of my statistics and
> business
> classes. I and a few of my study buddies would enter all
> kinds of
> equations within equations with tons of variables before
> every test.
> The instructors actually encouraged us to do this. One
> time, while I
> was doing an intership at the IRS, I even created an
> equation that
> would figure out your taxes (1040 with deductions and
> more!). All of
> these equations were lost many years ago because I would
> always
> forget to replace the batteries.
>
> Anyway, the solver on the 27s was fairly simple to use
> compared to
> what is on the HP50g. I love the way a 50g can create
> graphs and the
> feel of the buttons. I've learned to use the equation
> writer and it
> is great at displaying equations in textbook style! But,
> I've yet to
> figure out how to write a simple equation and retrieve it
> for later
> use. For example, I'd like to enter the quadratic
> equation and be
> able to use it from time to time. Any pointers would be
> greatly
> appreciated. I do have a copy of the User's Manual and
> User's Guide
> in .pdf form.
>
> Quadratic Equation (one each for +/-):
>
> 1.
> x=(-b+Sqrt(b^2-4ac))/2a
>
> 2.
> x=(-b-Sqrt(b^2-4ac))/2a
>
> Thanks in Advance