Question

x (x+4)=117 alguém me ajuda ?

Answer 1

$x(x + 4) = 117 \\ {x}^{2} + 4x - 117 = 0 \\ \\ delta = 16 + 468 = 484 \\ \\ x = \frac{ - 4 + \sqrt{484} }{2} = \frac{ - 4 + 22}{2} = \frac{18}{2} = 9 \\ \\ x = \frac{ - 4 - \sqrt{484} }{2} = \frac{ - 4 - 22}{2} = \frac{26}{2} = 13$


S = {9, 13}