Hi

 2L + 2W = 26FT

  L = 13-W

W*L = 36 FT^2

W(13-W) = 36

 13W - W^2 = 36

  W^2 -13W + 36 = 0

FACTORING

 (W- 9)(W-4) = 0

 (W- 9)=0   W = 9FT , L = 4FT

 (W-4)= 0   W = 4FT , L = 9FT 

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