50g

Oops, that should be...
PLUS(A,B,C)=(-B+(B^2-4*A*C)^.5)/(2*A)
and
MINUS(A,B,C)=(-B-(B^2-4*A*C)^.5)/(2*A)

--- On Thu, 7/17/08, Don Hart <ddhart1@...> wrote:

> From: Don Hart <ddhart1@...>
> Subject: Re: [50g] HP 27S Solver & HP 50g Solver
> To: 50g@yahoogroups.com
> Date: Thursday, July 17, 2008, 9:50 PM
> 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
> 
> 
> 
>       
> 
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