Hi

a box has a square base, with xcm sides and (x+2)height

Surface area = x^2 + x^2 + 4[x(x+2)]

  2x^2 +4x^2 + 8x = 120 cm^2

     6x^2 + 8x - 120 = 0

     3x^2 + 4x - 60 = 0



  x = 3.8549cm   |tossing out negative solution for length

 

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