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

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

Hi,

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Posted on Jan 02, 2017

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

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

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

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

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

The formula to calculate the hypotenuse of a right angled triangle is a^2 + b^2 = c^2 or in words, a squared plus b squared is equal to c squared. The most common mistake is that students make the hypotenuse a squared or b squared. The hypotenuse has to be c squared. Thus, when figuring out the sides of a right-angled triangle, always make sure the hypotenuse is the longest side.

For example, a triangle with sides of length 3 and 4, calculate the hypotenuse. Let a be 3 and b be 4. 3^2 + 4^2 = c^2 or 9+16 = c^2, or 25 = c^2. Now take the square root of both sides and we get c = 5.

For example, a triangle with sides of length 3 and 4, calculate the hypotenuse. Let a be 3 and b be 4. 3^2 + 4^2 = c^2 or 9+16 = c^2, or 25 = c^2. Now take the square root of both sides and we get c = 5.

Feb 18, 2015 | Office Equipment & Supplies

335 / 113 will get you close. Sqrt(sqrt(2143/22)) will get you even closer.

May 17, 2014 | Office Equipment & Supplies

What model Casio calculator? On some models you may need an additional set of parentheses so that the sum of squares goes into the square root.

Sep 26, 2013 | Casio Office Equipment & Supplies

Use the square-root function. It's the g-shifted function of the y^x key, leftmost on the second row. For example, to calculate the square root of two, press 2 g square-root

Sep 21, 2013 | HP 12c Calculator

The square root is the second function of the "3" key. To calculate the square root of 3, press 3 2ndF 3 =

May 25, 2013 | Sharp EL-738 Scientific Calculator

Use the quadratic formula or completing the square.

Completing the square:

x^2 -13x=-36

x^2-2*(13/2) +(13/2)^2=-36+(13/2)^2

The left side can be factored as (x-13/2)^2.

The right side is (13^2-36*4)/4=(169-144)/4=25/4

Assembling the two sides

(x-13/2)^2=25/4

Taking the square roots x-13/2=+ or - 5/2

Case 1 : x-13/2=+ 5/2.

Solving for x you get the first root as x=(5+13)/2=18/2=9

Case 2 : x-13/2=-5/2.

Solving for x, you get the other root as x=(13-5)/2=8/2=4.

The roots are x1=9, and x2=4

Completing the square:

x^2 -13x=-36

x^2-2*(13/2) +(13/2)^2=-36+(13/2)^2

The left side can be factored as (x-13/2)^2.

The right side is (13^2-36*4)/4=(169-144)/4=25/4

Assembling the two sides

(x-13/2)^2=25/4

Taking the square roots x-13/2=+ or - 5/2

Case 1 : x-13/2=+ 5/2.

Solving for x you get the first root as x=(5+13)/2=18/2=9

Case 2 : x-13/2=-5/2.

Solving for x, you get the other root as x=(13-5)/2=8/2=4.

The roots are x1=9, and x2=4

Apr 20, 2011 | Casio FX-115ES Scientific Calculator

To calculate the square root of 9, press

2nd [square-root] 9 ) =

The square-root is the shifted function of the x-squared key, just to the left of the 7 key. The close-parenthesis is needed to balance the open-parenthesis automatically inserted by the square-root function.

2nd [square-root] 9 ) =

The square-root is the shifted function of the x-squared key, just to the left of the 7 key. The close-parenthesis is needed to balance the open-parenthesis automatically inserted by the square-root function.

Feb 16, 2011 | Texas Instruments TI-30 XIIS Calculator

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.

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.

1. If discriminant is larger than zero you have two solutions. Let us call them x1 and x2.

Then

and

2.

3.

To find the solutions you

Hope it helps.

Jun 26, 2009 | Sharp EL-531VB Calculator

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.

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.

1. If discriminant is larger than zero you have two solutions. Let us call them x1 and x2.

Then

and

2.

3.

To find the solutions you

Hope it helps.

May 17, 2009 | Sharp EL-531VB Calculator

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.

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.

1. If discriminant is larger than zero you have two solutions. Let us call them x1 and x2.

Then

and

2.

3.

To find the solutions you

Hope it helps.

May 05, 2009 | Sharp EL-531VB Calculator

Feb 26, 2015 | HP 12c Calculator

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