How do you do find the equation of a cubic function?

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- March 20th 2010, 01:56 PMllamajuiceFinding equation of a cubic function?
How do you do find the equation of a cubic function?

- March 20th 2010, 02:02 PMskeeter
find what ... zeros?

http://www.mathhelpforum.com/math-he...functions.html - March 20th 2010, 02:10 PMllamajuice
theres no zeroes.

like its just a normal graph and i need to find an equation that models the behavior of the graph. - March 20th 2010, 02:23 PMskeeter
- March 20th 2010, 02:28 PMllamajuice
because it looks like one. :D

well first i just plotted the points into excel then i tried all the lines of best fit to see which one it matched. It could also be a sine graph thing, but any polynomial of a degree of 3 or higher works too so i thought finding a cubic function that matches it would be easiest.

do i just sub in points into y=ax^3 +bx^2 +cx +d to get 4 formulas then solve? - March 20th 2010, 02:37 PMskeeter
- March 20th 2010, 02:47 PMllamajuice
its like height vs age so theres no x- intercepts

- March 20th 2010, 02:48 PMe^(i*pi)
- March 20th 2010, 02:59 PMllamajuice
scratch that its body mass index