Question 376217

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Hi
Let x represent the length of each side of the square
P = 4x
question states***
x^2 = 45 + 4x
x^2 - 4x -45 = 0
(x - 9)(x+5) = 0
(x+5)= 0
x = -5 cannot use
(x-9)= 0
x = 9, the length of each side of the square
CHECKING our Answer***
9^2 = 81 = 4*9 + 45 = 36 + 45 = 81