Question

Encontre as raizes da equacao: ײ-8×-12=0?

Answer 1

${x}^{2} - 8x - 12 = 0 \\ x = \frac{ - ( - 8) + - \sqrt{( - 8 {)}^{2} - 4 \times 1 \times ( - 12) } }{2} \\ \\ x = \frac{8 + - \sqrt{112} }{2} \\ \\ x = 4 + 2 \sqrt{7} \\ x = 4 - 2 \sqrt{7}$