Question 492498
Basically, this tells us that
{{{s*s = (s+8)(s-4)}}}
s is the length of the square's side. So, the area of the square is s^2, and the area of the rectangle is (s+8)(s-4)
Simplify.
{{{s^2 = s^2+4s-32}}}
The s^2 cancel out.
{{{0 = 4s-32}}}
Add 32 to both sides.
{{{32 = 4s}}}
Divide by 4.
{{{8 = s}}}