Data
length = x + 7
width = x
Perimeter = 170 ft
area = ?
Perimeter = 2l + 2w
Substitution
170 = 2(x + 7) + 2(x)
Solve for x
170 = 2x + 14 + 2x
170 - 14 = 4x
156 = 4x
x = 156/4
x = 39
Calculate the area
area = (x)(x)
Substitution
area = (39)(39)
Result
area = 1521 ft^2
