Question

x²-x-12=0 equação de segundo grau

Answer 1

${x}^{2} - x - 12 = 0$

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

$x = \frac{1 + - \sqrt{1 + 48} }{2}$

$x = \frac{1 + - \sqrt{49} }{2}$

$x = \frac{1 + - 7}{2}$

$x = \frac{1 + 7}{2} \\ x = \frac{1 - 7}{2}$

$x = 4 \\ x = - 3$