please help me

please help me is 3. I added to a positive number gives the square of the a amber. Find the number.

Let the no be x.
So acc. To question.
x+1=x^2
So, x^2-x-1.

After solving by quadraric formula.
D= 1*1+4*1
=5
X= 1+- root 5 /2.
The no is 1+-root5 /2