Respuesta :

(2x + 16)(2x + 12) = 396 
4x2 + 24x + 32x + 192 = 396 
4x2 + 56x - 204 = 0 
x2 + 14x - 51 = 0 
(x + 17)(x - 3) = 0 
x + 17 = 0 v x - 3 = 0 
x = -17 or x = 3

you can exclude negative value because x cannot be negative :)
Checking:
(16+2*3) * (12 + 2*3) is equal ? 396?
True

So the walkway size is:
22 x 18

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