Answer:
original dimensions = 6 feet side
Step-by-step explanation:
we can represent this problem as
x^2 + (x + 3)^2 = 117
x^2 + x^2 + 6x + 9 = 117
combine like terms
2x^2 + 6x + 9 = 117
set equal to 0
2x^2 + 6x - 108 = 0
divide by 2 to simplify
x^2 + 3x - 54 = 0
factorise
(x - 6)(x + 9) = 0
x = 6, x = -9
side of square cannot be negative so x = 6
