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[Solved] - ClassPad 400 software

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Posts: 40
Joined: Tue Dec 17, 2013 12:56 pm
Calculators: Casio fx-9860GII, Casio Classpad fx-CP400

[Solved] - ClassPad 400 software

Postby PsySc0rpi0n » Tue Dec 17, 2013 1:07 pm

Hi everyone...

I'm just waiting for my FX CP 400 but i'm using the software trial to get used to the calculator and I have already looked in the manual for that old menu that was used to solve simultaneous unkowns equations and i can't find that function...

Can you tell me where can i find that function in the ClassPad software?

If you don't know what I mean i explain with na exemple:

I have 3 equations with 3 unkowns...
And there was a menu in the old Casios that was called Equations, and inside this menu there were 3 options like 1 - polinomial, 2-simultaneous and 3-solve.

When we choose Simultaneous, I was asked for how many unkowns between 1 and 6.
Then i would place the coeficientes of each unknow for each equation and the result would come out in seconds...

I cna't find this anywhere in CP400 software...
Last edited by PsySc0rpi0n on Sun Dec 22, 2013 2:11 pm, edited 1 time in total.

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Joined: Wed Dec 18, 2013 8:13 am
Calculators: Casio fx-9860G SD, Casio fx-9860G Slim, Casio fx-9860G AU, Casio Classpad 300, Casio Classpad 300 plus, Casio Classpad 330, Casio Classpad 330 plus, Casio Classpad fx-CP400

Re: ClassPad 400 software

Postby smith9850 » Wed Dec 18, 2013 8:24 am

Hi,

In Main, open the keyboard, and from Math1 menu tap twice on icon above 'tan' (Sim Eqns template expands with every tap... to as many vars as you need - 6 or 10 or ...)

Enter your 3 eqns in 3 boxes on left, enter 3 variables to solve for in single box (eg x,y,z) and tap EXE.
Easy!

To solve any single variable eqn in x (eg polynomials, exponentials, etc), just type it in, tap EXE and chuck solve on the next line, tap EXE.

Visit charliewatson.com/classpad and look at eActivities for some good ideas on solving stuff

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Posts: 40
Joined: Tue Dec 17, 2013 12:56 pm
Calculators: Casio fx-9860GII, Casio Classpad fx-CP400

Re: ClassPad 400 software

Postby PsySc0rpi0n » Fri Dec 20, 2013 11:41 am

Hi.

Thanks a lot for replying...

And after I do hat, i should only enter the coeficientes or the whole expression?

In the old Casio We nly enter with the coeficientes in a matriz, like:

anX+bnY+cnZ=dn

2x+3y+4z=0
-x-5y+8z=0
3x+y/2+z=0

Then we had a 4x3 matrix where we would write the an, bn, cn and dn of each equation...

2 | 3 | 4 | 0
-1 |-5 |8 | 0
3 |1/2|1 | 0

Now it's quite different...

Member
Posts: 40
Joined: Tue Dec 17, 2013 12:56 pm
Calculators: Casio fx-9860GII, Casio Classpad fx-CP400

Re: ClassPad 400 software

Postby PsySc0rpi0n » Fri Dec 20, 2013 12:26 pm

But for some reason this is not working...

I want to solve this 3 equations:

3x+2y-12z=0
x/3+2x/9-12z=0
3x/2+y-6z=0

This equations should result in x = 3, y = 2 and z = 1 but the calculator is returning x = 2.4z, y = 2.4z e z = z...

Now the calculator is already giving a different result...

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Location: Portugal
Calculators: Casio fx-CG20

Re: ClassPad 400 software

Postby gbl08ma » Fri Dec 20, 2013 1:33 pm

PsySc0rpi0n wrote:This equations should result in x = 3, y = 2 and z = 1


They certainly don't:
3*3+2*2-12*1=0 <=> 1=0 , which is wrong
3/3+2*2/9-12*1=0 <=> -95/9 = 0 , which is wrong
3*3/2+2-6*1=0 <=> 1/2 = 0 , which is wrong
Wow, looks like the solutions you think are right, actually don't fit in any of the equations of the simultaneous system!

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Posts: 40
Joined: Tue Dec 17, 2013 12:56 pm
Calculators: Casio fx-9860GII, Casio Classpad fx-CP400

Re: ClassPad 400 software

Postby PsySc0rpi0n » Fri Dec 20, 2013 3:27 pm

Yes you're right... I meant x=2, y=3 and z=1...

The system is right, I just wrote the values the wrong order...

3x2 + 2 x 3 - 12x1 = 0
1*2/3 + 2x3/9 -12x1/9 = 0
3x2/2 + 3 - 6 = 0

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