Question 1178964
the area of the rectangle will be (x+3)(x-3)=x^2-9 ft^2
that equals 16 ft^2
so x^2-9=16
x^2=25
xor S i=5 feet, only positive root. That is the answer.

s=5 with area of square 25^2
the rectangle is 8 ft x 2 ft with area 16 ft^2.