hello! I'm having a bit of trouble trying to solve this, could anyone help explain it to me?

[tex]\displaystyle\ 60^2 =36(36+x)\\\\1296+36x=3600\\\\36x=2304\\\\\boxed{x=64}[/tex]
Step By Step Explanation:
Calculate 60 to the power of 2 and get 3600.
Use the distributive property to multiply 36 by 36 + ×.
Swap sides so the all variable terms are on the left hand side.
Subtract 1296 from both sides.
Subtract 1296 from 3600 to get 2304.
Divide both side by 36.
Divide 2304 by 36 to get 64
My Answer is