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Polynomial equation solve problems

Polynomial equation equation solve

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#1 KingVsGaramja

KingVsGaramja

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Posted 13 February 2017 - 04:25 AM

Hi friends,

Today i have problems in equation solve. I have casio fx 991EX classwiz, and i have this equation:

 

x3-2x2-4x+8=0

 

But when i am going to solve this equation on my calculator it give me only X1 and X2 value why it don't give me the X3 value??????

Please help me and give the solution for this problems.

 

 



#2 pan.gejt

pan.gejt

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Posted 13 February 2017 - 10:16 AM

Well, the cubic equation has 2 possible situations

 

- one real root and two complex roots, e.g. x^3+1=0

- three real roots

                           - all roots are different

                                    e.g. x^3-4x^2-7x+10=0

                           - single solution, all roots are the same

                                    e.g. x^3-3x^2+3x-1=0

                           - two distinctive solutions, one root is different and two roots are the same (the equation has two roots)

                                    e.g. your equation has two roots, x1=-2 and x2=x3=2

 

 

Your calc has QR code button (shift + optn). If you have android powered phone or tablet with camera and available internet connection, you can see the graph of your equation. 

You need only this app

https://play.google....fx.CasioEduPlus


Edited by pan.gejt, 13 February 2017 - 11:07 AM.





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