Question 394643
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Hi
Let x represent the width of the walk. Garden has an Area= 15*9 = 135 ft^2
Question states***
 (15+2x)(9+2x) - 135ft^2 = 432ft^2, the area of the path.
solving for x
 135 + 48x + 4x^2 - 135 = 432
    4x^2 + 48x - 432 = 0
     x^2 + 12x - 108 = 0
factoring or using quadratic formula {{{x = (-12 +- sqrt(576 ))/(2) = (-12 +- 24)/2 }}} 
   (x + 18)(x-6) = 0   |tossing out negative solution for length
            x = 6ft, the width of the walk