Question about HP 12c Calculator

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How do you calculate square root on HP12C?

I need the formula for square root calculation on my HP12C.

Posted by Anonymous on

1 Answer

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  • HP Master
  • 102,366 Answers

Use the square root function. It's the g-shifted function of the 1/x key (second key from the left on the second row).

Posted on May 14, 2014

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Posted on Jan 02, 2017

  • 579 Answers

SOURCE: HP12C

Yes, take it apart, and wash the circuit board.
Hard part is taking it apart without breaking the little tabs that snap the case together. It may have a couple hidden screws somewhere like in the batt compartment or under a label or under the rubber feet. Then carefully pry the case joint apart to get the snaps to let loose. Then the circuit board easily comes out - be careful if all the keys are loose not to disturb them. Also be careful of the display that may be loosely mounted. Once you get the board out, you can wash it with soap and water - whatever, just rinse it when clean with something like alcohol so no residues are left. Also be careful to not rub off any off the black key contact spots where the keys touch it. Put it back together loosely and see if it works.
Hope Ya Fix It!

Posted on Feb 05, 2008

  • 1 Answer

SOURCE: I hit a wrong key and now my hp12c will not clear

My mother worked for HP in the 60's - 80's and when I became a banker she gave me one of the first HP 12c's. One of the things we first noticed was how quickly we went through batteries, or so we thought that was the reason why the calculator was giving us wrong answers.

My mother came up with a solution which I still use today. If you have tried all known solutions, turn off the calculator and take the cover off the battery and remove the battery. Using a standard paperclip, stretch out the clip so that you can touch both sides of the metal casing where the battery normally sits (sometimes you have to tough the casing and then something metal outside the casing). The best way I can explain, is that it is like grounding out an older car alternater. Put the battery back; put the cover back on, turn on the calculator. If you get a
"Pr Error" message this is good news. Simply select the CLX key and life is wonderful again.
Don’t ask me why this works …. But what the heck …. It’s been working for me for years. Good Luck
Sherry-Lee and Winston the Super Rescued Dog by the Sea

Posted on Nov 17, 2008

Coleman37
  • 337 Answers

SOURCE: Hi, I have an HP12C and for some reason the

Turn the calculator off. Hold down the period (decimal) key and hit the "ON" button at the same time.

Posted on Mar 03, 2010

reyjoshua07
  • 1157 Answers

SOURCE: HP12c I replaced batteries after

Hi jmccann656,

If you're having hard time turning on the calculator, it might caused by some changes on its setting. The best way to resolve this issue is by doing a calculator resetting. Please take note that resets will erase the memory on the calculator and restore the calculator's defaults. I recommend to back up any critical data before performing the reset. To reset the hp 12c (HP12C) calculator, follow the procedures below.

1. Press ON to turn off the calculator.

2. Press and hold { - }.

3. Press and release ON.

4. Release { - }.

5. The screen will display "Pr Error"

6. Press {Enter} and the calculator will reset to the default settings, and the memory will be erased.

If the HP12C calculator wont turn on and still performing unexplained errors , it might have a static charge. This means the capacitor is full. The previous reset will not drain the capacitor. With this calculator, there are two options for draining the capacitor. The option to use is dependent upon the serial number of the calculator to be reset. The first option is a paperclip reset.

A paperclip reset can be performed on all HP 12C calculators. These calculators will have three 1.5 volt button cell batteries. Follow these steps for calculators in this serial number range:

1. Remove HP12C the battery door.

2. Take the batteries out.

3. Take a paper clip and bend it out enough to cross over from one terminal to the other.

4. Hold the paper clip across the battery terminals for approximately ten seconds.

5. Replace with a fresh set of batteries, being sure to follow the polarity assigned. Note the picture beside the battery cover.

6. Replace battery door.

7. Turn on the HP12C calculator. The display should read "Pr Error". Press and release the ON key twice.

Hope it helps.

Thank you for using FixYa.

Posted on Mar 25, 2011

rlekeyii
  • 95 Answers

SOURCE: 300,000 is 86.2 percent of what number? Could you

set the problem up like so:

300,000 86.2
_______ = _____
x 100



To solve for x, take 300,000 * 100 / 86.2

The answer is 348,027.84


Good Luck,
Rodrick

Posted on Apr 22, 2011

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The left side can be factored as (x-13/2)^2.
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Case 1 : x-13/2=+ 5/2.
Solving for x you get the first root as x=(5+13)/2=18/2=9

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Hello,
This calculator does not have a program to which you give the equation, and which returns the solutions. Sorry. You have to use the formulas you learned.
Let the equation be ax^2 +bx+c=0
You compute the discriminant Call it disc.
disc= (b^2-4*a*c)
1. If discriminant is larger than zero you have two solutions. Let us call them x1 and x2.
Then x1=(-b+square root of disc)/(2*a)
and x2= (-b-square root of disc)/(2*a)

2. If disc=0 , square root of disc =0 and x1=x2=-b/(2*a)
3. If disc is negative, there are no real solutions.

To find the solutions you replace a, b, and c by their numerical values, to calculate disc, its square root, and calculate X1 and X2.

Hope it helps.

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How do I use sharp EL 531W to solve quadratic equations?


Hello,
This calculator does not have a program to which you give the equation, and which returns the solutions. Sorry. You have to use the formulas you learned.
Let the equation be ax^2 +bx+c=0
You compute the discriminant Callit disc.
disc= (b^2-4*a*c)
1. If discriminant is larger than zero you have two solutions. Let us call them x1 and x2.
Then x1=(-b+square root of disc)/(2*a)
and x2= (-b-square root of disc)/(2*a)

2. If disc=0 , square root of disc =0 and x1=x2=-b/(2*a)
3. If disc is negative, there are no real solutions.

To find the solutions you replace a, b, and c by their numerical values, to calculate disc, its square root, and calculate X1 and X2.

Hope it helps.



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Hello,
This calculator does not have a program to which you give the equation, and which returns the solutions. Sorry. You have to use the formulas you learned.
Let the equation be ax^2 +bx+c=0
You compute the discriminant Call it disc.
disc= (b^2-4*a*c)
1. If discriminant is larger than zero you have two solutions. Let us call them x1 and x2.
Then x1=(-b+square root of disc)/(2*a)
and x2= (-b-square root of disc)/(2*a)

2. If disc=0 , square root of disc =0 and x1=x2=-b/(2*a)
3. If disc is negative, there are no real solutions.

To find the solutions you replace a, b, and c by their numerical values, to calculate disc, its square root, and calculate X1 and X2.

Hope it helps.

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