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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
Administrator
From: Bumpkinland
Registered: 2009-04-12
Posts: 90,866

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.

I agree with you regarding the satisfaction and importance of actually computing some numbers. I can't tell you how often I see time and money wasted because someone didn't bother to run the numbers.

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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 bundy
Moderator
Registered: 2010-06-20
Posts: 6,538

Re: Cubic equation


You cannot teach a man anything;  you can only help him find it within himself..........Galileo Galilei

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#5 2012-10-20 08:32:14

bobbym
Administrator
From: Bumpkinland
Registered: 2009-04-12
Posts: 90,866

Re: Cubic equation

Or one even nastier than that.

http://www.mathisfunforum.com/viewtopic … 00#p198900

See post#6.


In mathematics, you don't understand things. You just get used to them.

I agree with you regarding the satisfaction and importance of actually computing some numbers. I can't tell you how often I see time and money wasted because someone didn't bother to run the numbers.

Offline

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