Question 1044719
How do you WANT to expand it?  Directly use Binomial Theorem formula?  Directly multiply?


{{{(x+y)^n=x^n*y^(0)+x^(n-1)y^(1)+etcetera+x^1*y^(n-1)+x^0*y^n}}}
The "etcetera" is because the three dots will not render here.


Your square is much simpler in your example.
{{{(4a)^2+(4a)(-2)+(4a)(-2)+(-2)^2}}}
SIMPLIFY THIS!