How to graph this function?

So I'm trying to graph a function and when I plot the following:

plot(y,(.65*y)-(0.65*y.^2/10.5));

It works fine but when I add in the second part of the equation there's an error that I don't know how to fix

plot(y,(.65*y)-(0.65*y.^2/10.5))-(((1.2*(y^2))/(1+(y^2))));

Answer 1

[Torsten]

plot(y,(.65*y)-(0.65*y.^2/10.5))-(((1.2*(y.^2))./(1+(y.^2))));

Best wishes

Torsten.