For quadratic equations, I use the polynomial solver.
right arrow NUM.SLV
3 (from menu) or press the tab for poly, depending on flag 117.
- hit mode, flags, and check flag 117 for menus.
press ok
left arrow bracket ([)
enter the coefficients you want with SPC (space) between the numbers
for example 3X^2 + 2X - 24 would be
Right arrow [ 3 2 -24 enter
arrow down 1 time to the line that says roots, and press solve, then enter
I get 2.51, and -3.18 for answers.
This can solve polynomials, even large ones. Just start entering coefficients from larget to smallest, with a constant as the final coefficient.
--- On Thu, 7/17/08, 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: Thursday, July 17, 2008, 1:45 AM
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