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Complete Square, Classpad 400


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#1 RetroEngineer

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Posted 26 April 2020 - 04:30 AM


Hi there,

Relatively new to using the Classpad 400 and absolutely love it.

Does anyone know how to complete the Square on classpad? Why did it omit this function?

Have a good day!

#2 pan.gejt

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Posted 26 April 2020 - 04:08 PM

Well, the completing the square is possible with 2 commands - collect and simplify, but the collect command needs some user's interaction.

 

https://keisan.casio...ompletingsquare

 

Let's have this example x^2+6×x+7

 

the 1st step

collect(x^2+6×x+7, x+3) => (x+3)×(x+3)-2

 

the 2nd step

simplify((x+3)×(x+3))-2 = >(x+3)^2-2

 

Notice: The parameter "x+3" in the collect command is the user's interaction - it is in form x+b/2 (in our case the b=6 and x+b/2=x+6/2=x+3)

For the simplify command put inside the parenthesis the terms with x only. If you put inside parenthesis all terms you get the original expression - x^2+6×x+7



#3 RetroEngineer

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Posted 15 May 2020 - 10:17 PM

Hi there,

Thank you very much for this walk around. I am sure in more complicated expressions, it will be useful to utilise this.

But Casio should really listen to its users and add in some of the small features that are not there on this amazing device.




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