solve by completing the square: A rectangular patio has a length of x+6m, a width of x+8m, and the total area of 400 m^2. find the dimensions to the nearest tenth

[tex](x + 8)( x + 6) = 400 \\ x { }^{2} + 14x - 352 = 0 \\ (x + 7) {}^{2} - 401 = 0 \\ x = - 7 + \sqrt{401} \\ [/tex]