i'm using an existing Maple mws that was created by some unknow version of Maple.
the Maple text is show below, and the old result is the last line (0.28031703)
T := ->(1/8)*sqrt(x^2+225)+(1/3)*sqrt((20-x)^2+625);
dT := D(T);
solve(dT(x) = 0, x);
Sols := %;
Xbest := Sols;
solve(25/(20-x) = 15./x, x);
when i run in with Maple 12 Student Edition, the result I get is
what am i doing wrong ? (i'm a 1st year calculus student and am learning this stuff). do i have to upgrade to a full Maple version to get this to work ?