Question

x ao quadrado sobre 3 - 3x - 54=0​

Answer 1

$\frac{x {}^{2} }{3} - 3x - 54 = 0 \\ x {}^{2} { - 9x } - 162 = 0 \\ x = \frac{ - ( - 9) + - \sqrt{ - 9 {}^{2} - 4 \times 1 \times ( - 162 )} }{2 \times 1} \\ x = \frac{9 + - \sqrt{81 - ( - 648)} }{2} \\ x = \frac{9 + - \sqrt{81 + 648} }{2} \\ x = \frac{9 + - \sqrt{729} }{2} \\ x = \frac{9 + -27 }{2} \\ x {}^{1} = \frac{9 + 27}{2} = \frac{36}{2} = 18 \\ x {}^{2} = \frac{9 - 27}{2} = \frac{ - 18}{2} = - 9$