Question

Решите пример:
${x}^{2} + 2x - 3 = 0$​

Answer 1

Решаем через дискриминант

Answer 2

${x}^{2} + 2x - 3 =0 \\ d =4 - 4 \times 1 \times ( - 3) = 4 + 12 =16 = {4}^{2} \\ x1 = \frac{ - 2 + 4}{2} = 1 \\ x2 \frac{ - 2 - 4}{2} = - 3$