Question about HP 19bII Calculator

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Posted on Apr 09, 2006

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HP doesn't sell spare parts for these calculators any more. If the door is the only part you need and the parts of the case opening that hold the door in place are still good, you could make a replacement door.

See the thread about making a battery door for an HP 28S (which uses the same case design as the 19BII).

Broken HP 28S battery cover repaired with brass sheet

See the thread about making a battery door for an HP 28S (which uses the same case design as the 19BII).

Broken HP 28S battery cover repaired with brass sheet

Sep 24, 2014 •
HP 19Bii Business Consultant Calculator

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1answer

The simultaneous equation solver requires the coefficients to be real. Similarly matrices must have real coefficients.

Your only alternative is to express each of A and B as a real part and imaginary part.

A= x1+iy1

B=x2+iy2.

Substitute x1+iy1 for A in the two equations. Substitute x2+iy2 for B in the two equations. Do the algebra. Gather real parts and gather imaginary parts. Split each original equation into two equations: One equation comes from setting Real Part of left side = real part of right side (1); the other equations comes from setting the imaginary part of left side= imaginary part of right side (here 0).

Do the same procedure for the 2nd original equation.

At the end of the process you will have 4 coupled linear equations in the 4 unknowns (x1,y1,x2,y2).

Then you might want to use the calculator to solve the derived system. Once you have x1,y1,x2,y2 you reconstruct A=x1+iy1, etc.

Your only alternative is to express each of A and B as a real part and imaginary part.

A= x1+iy1

B=x2+iy2.

Substitute x1+iy1 for A in the two equations. Substitute x2+iy2 for B in the two equations. Do the algebra. Gather real parts and gather imaginary parts. Split each original equation into two equations: One equation comes from setting Real Part of left side = real part of right side (1); the other equations comes from setting the imaginary part of left side= imaginary part of right side (here 0).

Do the same procedure for the 2nd original equation.

At the end of the process you will have 4 coupled linear equations in the 4 unknowns (x1,y1,x2,y2).

Then you might want to use the calculator to solve the derived system. Once you have x1,y1,x2,y2 you reconstruct A=x1+iy1, etc.

Aug 29, 2011 •
Casio FX-9860G Graphic Calculator

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1answer

Not with that calculator. You can use Wolfram Alpha to solve most equations very quickly: http://www.wolframalpha.com/input/?i=x^2+-+3x+-+4+%3D+0

You can even use it to solve systems of equations: http://www.wolframalpha.com/input/?i=2x+%2B+3y+%3D+5%2C+4x+-+3y+%3D+1

Enjoy.

You can even use it to solve systems of equations: http://www.wolframalpha.com/input/?i=2x+%2B+3y+%3D+5%2C+4x+-+3y+%3D+1

Enjoy.

Mar 03, 2011 •
Texas Instruments TI30X IIB Scientific...

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1answer

This calculator doesn't really support a solver like that. You can use Woflram Alpha to solve equations like that really quickly. Example

There are more expensive calculators that will solve these types of equations, but I would recommend just using Wolfram Alpha whenever you need a solution to a math problem.

There are more expensive calculators that will solve these types of equations, but I would recommend just using Wolfram Alpha whenever you need a solution to a math problem.

Mar 02, 2011 •
Casio FX-115ES Scientific Calculator

1helpful

2answers

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Hello,

Since you know about the catalog, that is where you find the equal sign, near the bottom of the list. It is faster if you scroll up from abs(.

Hope it helps.

Since you know about the catalog, that is where you find the equal sign, near the bottom of the list. It is faster if you scroll up from abs(.

Hope it helps.

Oct 07, 2009 •
Texas Instruments TI-84 Plus Calculator

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1answer

Hello,

In your manual, Appendix Program Library, (Page A1) you have the listing of the problem to solve the quadratic equation. Type it in your calculator and execute it.

Hope it helps.

In your manual, Appendix Program Library, (Page A1) you have the listing of the problem to solve the quadratic equation. Type it in your calculator and execute it.

Hope it helps.

Aug 13, 2009 •
Casio FX-9750GPlus Calculator

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2answers

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Apr 27, 2009 •
Casio CFX-9850G Plus Calculator

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1answer

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1answer

Hello,

Put fresh batteries (main batteries)

Clear the RAM of junk variables and programs that clutter it" [2nd][MEM][F1][1:All memory]

Brush up on you calculator skills: shortcuts, command syntax for the commands you want to use; and start again. It might seem faster.

And no (The myth of the Paradise Lost has been with humanity since the beginings of time) if calculator has grown old there is not much you can do about it.

Hope it helps.

Put fresh batteries (main batteries)

Clear the RAM of junk variables and programs that clutter it" [2nd][MEM][F1][1:All memory]

Brush up on you calculator skills: shortcuts, command syntax for the commands you want to use; and start again. It might seem faster.

And no (The myth of the Paradise Lost has been with humanity since the beginings of time) if calculator has grown old there is not much you can do about it.

Hope it helps.

Dec 03, 2008 •
Texas Instruments TI-89 Calculator

0answers

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