-----maxima-bounces at math.utexas.edu wrote: -----
>hi, I am new to maxima and I would like to solve this equation:
>([px1,py1] + t*[vx1,vy1] - ([px2,py2] + t*[vx2,vy2]))^2 = (r1+r2)^2 for t.
In Maxima, [a,b] is a list with two items. So the left side of your equation is a list,
but the right side is not a list. Also, [a,b]^2 = [a^2,b^2]. Once you express the
equations as two scalar equations, solve might work OK.
--bw