# Quartic_Solver ( a, b, c , d, e, which_x )

Finds Real Roots of Quartic Equation a*x^4 + b*x^3 + c*x^2 + d*x + e = 0

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Dr. Ronald W. Satz Transpower Corporation http://www.transpowercorp.com |

(

[

a = -20 ;

b = 5 ;

c = 17 ;

d = -29 ;

e = 87 ;

which_x = 1

] ;

Quartic_Solver ( a ; b ; c ; d ; e ; which_x )

)

Function definition: (Copy & paste into FileMaker's Edit Custom Function window)

You can, of course, change the precision to whatever you want (or even take it off altogether). If the x you want is complex, you'll simply get a "?" for the result. For most problems in physical science, you will want a real root. But you may have to run the program up to four times to get the root which makes physical sense. Ref.: Wikipedia ("Quartic Function")

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