Question

X ao quadrado -2X-3=0

Answer 1

${x}^{2} - 2x - 3 = 0 \\ x = \frac{ - ( - 2)± \sqrt{( - 2) {}^{2} - 4 \times 1 \times ( - 3) } }{2 \times 1} \\ x = \frac{2±4}{2} \\ x1 = - 1 \\ x2 = 3$