Question 154261
6(x-12)(x-12)=864
6(x^2-24x+144)=864
6x^2-144x+864=864
6x^2-144x=0
6x(x-24)=0
x-24=0
x=24 feet for the sides of the square piece of sgheet metal.
proof:
6(24-12)(24-12)=864
6*12*12=864
864=864