kill(all)$
fpprintprec:4$

van=facebook.com/LearningCalculus$

f(x):=x-3/x=4;

solution: solve(f(x),x);

x1:first(solution);

x2:second(solution);

g(x):=(x-3)^2+9/(x-3)^2;

float(solve(fullratsimp(g(x1)),x));

float(solve(fullratsimp(g(x2)),x));