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#1 2012-10-19 19:49:48
- Harold
- Guest
Cubic equation
How do i solve a equation of this form ax^3+bx^2+cx+d=0 is there a formula?please explain
#2 2012-10-19 20:34:50
- bobbym
- bumpkin
- From: Bumpkinland
- Registered: 2009-04-12
- Posts: 109,606
Re: Cubic equation
Hi Harold;
Yes, there is a formula but no one ever uses it.
In mathematics, you don't understand things. You just get used to them.
If it ain't broke, fix it until it is.
Always satisfy the Prime Directive of getting the right answer above all else.
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#3 2012-10-19 20:45:15
- zetafunc.
- Guest
Re: Cubic equation
It would be helpful to remember but you're unlikely to use it very often. Try to find the first by inspection (or iteration if you have a calculator), then determine the quadratic factor from there.
#4 2012-10-19 20:53:55
- Bob
- Administrator
- Registered: 2010-06-20
- Posts: 10,648
Re: Cubic equation
Children are not defined by school ...........The Fonz
You cannot teach a man anything; you can only help him find it within himself..........Galileo Galilei
Sometimes I deliberately make mistakes, just to test you! …………….Bob 
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#5 2012-10-20 08:32:14
- bobbym
- bumpkin
- From: Bumpkinland
- Registered: 2009-04-12
- Posts: 109,606
Re: Cubic equation
In mathematics, you don't understand things. You just get used to them.
If it ain't broke, fix it until it is.
Always satisfy the Prime Directive of getting the right answer above all else.
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