y=5x+(1/x)
as x get kloes tu 0, 1/x blo up so y gotu infinite on rite side
gotu -infinity on left side
basik problem is tu find point as x inkreez weer 5x overcome 1/x
dy/dx=5 -1/x^2
tangent=0 at (1/x^2)=5
or x^2=1/5
or x=1/root(5)
at this point, y=5*[1/root(5)] +root(5)
y= [5/root(5)] +root(5)
but root(5)=5/root(5)
y=(5+5)/root(5)
=10/root(5)
=10/2.236067977
=4.472135955