Question 1074639
{{{drawing(700/3,400,-3,4,-3,9,

graph(700/3,400,-3,4,-3,9),

circle(2,3,.05), circle(-1,2,.05),circle(1,2,.05),circle(0,7,.1),

locate(2,3,"(2,3)"), locate(-1,2,"(-1,2)"),locate(1,2,"(1,2)"),locate(0,7,"(0,7)")   )}}}

Sorry, but there is no way to get a radical function to go 
through those four points.  The best you can do is get this kind
of a graph:

{{{drawing(700/3,400,-3,4,-3,9,

graph(700/3,400,-3,4,-3,9, (2+2/3)x^3-5x^2-(2+2/3)x+7),

circle(2,3,.05), circle(-1,2,.05),circle(1,2,.05),circle(0,7,.1),

locate(2,3,"(2,3)"), locate(-1,2,"(-1,2)"),locate(1,2,"(1,2)"),locate(0,7,"(0,7)")   )}}}

but that's a cubic function, not a radical function.  Did you get
one or more of the points wrong?  You can tell me about what you
want in the thank-you note form below and I'll get back to you by
email.  No charge ever.  I do this as a hobby.

Edwin</pre>