Hi

a^2+b^2=c^2 

x^2+(x+4)(x+4)= (x+8)(x+8)  |good work on the Set Up

 x^2 + x^2 + 8x+ 16 = x^2 + 16x + 64

   x^2-8x-48 = 0

factoring

 (x+4)(x-12) = 0

  (x+4)=  0   x = -4  |tossing out negative solution for length

  (x-12) = 0  x = 12

 three sides are 12, 16 and 20



CHECKING our Answer***

 12^2 + 16^2 = 144 + 256 = 20^2 = 400 

Answer by Sphinx pinastri(17)   (Show Source): You can put this solution on YOUR website!
 That's right. You just need to solve the square equation.









Another root is negative. 

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