Barton Willis wrote:
>one more thing:
>
>(%i1)
>q:2*(5.5*s^2+36.25380116959065*s+63.76900584795322)/(s*(s^2+4*s+3)*(2*(5.5*
>s^2+36.25380116959065*s+63.76900584795322)/(s*(s^2+4*s+3))+1))$
>
>(%i2) load("nummod")$ <--- nummod(4).zip from
>http://www.unk.edu/facstaff/profiles/willisb/
>
>(%i3) factor(q);
>RAT replaced 63.76900584795322 by 21809//342 = 63.76900584795322
>RAT replaced 36.25380116959065 by 30997//855 = 36.25380116959065
>RAT replaced 5.5 by 11//2 = 5.5
>RAT replaced 63.76900584795322 by 21809//342 = 63.76900584795322
>RAT replaced 36.25380116959065 by 30997//855 = 36.25380116959065
>RAT replaced 5.5 by 11//2 = 5.5
>
>(%o3) (9405*s^2+61994*s+109045)/((s+5)*(855*s^2+8550*s+21809)) <--- notice
>the linear factor
>
>No more linear factor!
>
>(%i4) factor(rationalize(q));
>(%o4)
>(774056185954304*s^2+5102268919941641*s+8974689717957159)/(70368744177664*s^3+1055531162664960*s^2+5313375152474633*s+8974689717957159)
>
>
>
>Barton
>
>___
>
A 3rd order polynomial can always be factored into a 1st order and a 2nd
order polynomial. Are you saying that Maxima can't do it?
Doug Stewart