what is (x+1) ​2

(x+1)^2 is the same as (x+1)(x+1). So, multiplying both binomial will give you the answer:

x^2+x+x+1. So, the final answer is x^2+2x+1.

Or if you mean in the form of a graph where that equation is set to be equal to 'y' it is a Parabola that is shifted along the X-Axis by 1...