There is no way to solve an 11-degree polynomial
algebraically. The best you could do would be to
draw the graph of its inverse by finding points
on f(x), such as
(-1,7), then its reverse (7,-1) is a point of f-1(x).
(0,3), then its reverse (3,0) is a point of f-1(x).
(1,13), then its reverse (13,1) is a point of f-1(x).
etc., etc.
You could graph it that way. But there is no closed algebraic
expression for f-1(x)
Edwin