# Thread: how can i solve this ??

1. ## how can i solve this ??

i want the way to solve this equation without using calculator to find value of x
x3 + ax2 + bx + c

2. Originally Posted by mido22
i want the way to solve this equation without using calculator to find value of x
x3 + ax2 + bx + c
hm... check what did you wrote there ... (first are those x2 x3 $x_2 , x_3$ or are they just $3x, 2x$ , and where is there equation )

3. Originally Posted by yeKciM
hm... check what did you wrote there ... (first are those x2 x3 $x_2 , x_3$ or are they just $3x, 2x$ , and where is there equation )
they are x^3 + (a*x^2) + (b*x) + c =0

4. Originally Posted by mido22
they are x^3 + (a*x^2) + (b*x) + c =0
$x^3+ax^2+bx+c =0$

if you looking for formula to solve that in that form than.... hm... it's huge if those i assume constants a,b,c were numbers than could be shown how to reduce that equation so it could be solved easier

or you can use Horner scheme , but anyway you need one zero first

5. Originally Posted by yeKciM
$x^3+ax^2+bx+c =0$

if you looking for formula to solve that in that form than.... hm... it's huge if those i assume constants a,b,c were numbers than could be shown how to reduce that equation so it could be solved easier

or you can use Horner scheme , but anyway you need one zero first
here is the problem link :
https://www.spoj.pl/problems/ROOTCIPH/

6. Originally Posted by mido22
here is the problem link :
https://www.spoj.pl/problems/ROOTCIPH/

hm.....

try this if helps you : x&#94;3&#43;ax&#94;2&#43;bx&#43;c&#61;0 - Wolfram|Alpha

and here you are how to do cubic polynomial : Solving Cubic Equations

hm.... or because your are writing code for that, maybe it would be easier to test first zero, and than simplify cubic polynomial... as i recall you can use algorithm hm... can't remember right now but as soon as i do i'll write it here (long time passed since i have done any programming )

7. Originally Posted by yeKciM
hm.....

try this if helps you : x&#94;3&#43;ax&#94;2&#43;bx&#43;c&#61;0 - Wolfram|Alpha

and here you are how to do cubic polynomial : Solving Cubic Equations

hm.... or because your are writing code for that, maybe it would be easier to test first zero, and than simplify cubic polynomial... as i recall you can use algorithm hm... can't remember right now but as soon as i do i'll write it here (long time passed since i have done any programming )
ok take your time but don't forget me