49 = {x}^{2} + {x}^{2} + 6x + 9 - {x}^{2} - 3x \ {x}^{2} + 3x - 40 = 0 \ {x}^{2} + 8x - 5x - 40 = 0 \ x(x + 8) - 5(x + 8) = 0 \ (x + 8)(x - 5) = 0 \ = > cd = 5 \ bc = 8 \ s = 40 times frac{ sqrt{3} }{2} = 20 sqrt{3}
49 = {x}^{2} + {x}^{2} + 6x + 9 - {x}^{2} - 3x \ {x}^{2} + 3x - 40 = 0 \ {x}^{2} + 8x - 5x - 40 = 0 \ x(x + 8) - 5(x + 8) = 0 \ (x + 8)(x - 5) = 0 \ = > cd = 5 \ bc = 8 \ s = 40 times frac{ sqrt{3} }{2} = 20 sqrt{3}