Answer:
40
Step-by-step explanation:
Side of square = x
Long side of rectangle = x + 5
Short side of rectangle = x - 3
(x - 3)(x + 5) = 84
[tex]x^2+2x-15=84[/tex]
x = 9, x = -11
X has to be 9 because x cannot be negative.
9 + 5 = 14
9 - 3 = 6
14 + 14 + 6 + 6 = 40
