Answer:
Side is equal to [tex](z+6)[/tex] feet.
Step-by-step explanation:
A square is a four sided polygon in which all sides are equal, diagonals are equal and each angle is equal to [tex]90[/tex]°
Area of a square = side × side
Area of a square [tex]=z^2+12z+36[/tex]
Here, write [tex]12z=6z+6z[/tex]
Therefore,
Area of a square [tex]=z^2+6z+6z+36[/tex]
[tex]=z(z+6)+6(z+6)[/tex]
[tex]=(z+6)^2[/tex] square feet
So,
side × side [tex]=(z+6)^2[/tex]
This implies side is equal to [tex](z+6)[/tex] feet.
