Question

Квадратные уравнения x^2+2x+10=0

Answer 1

${x}^{2} + 2x + 10 = 0 \\ d = {b}^{2} - 4ac = {2}^{2} - 4 \times 10 = \\ = 4 - 40 = - 36 \\ \sqrt{d} = \sqrt{ - 36} = \sqrt{ 36 \times - 1} = 6i \\ x1 = \frac{ - 2 + 6i}{2} = - 1 + 3i \\ x2 = \frac{ - 2 - 6i}{2} = - 1 - 3i$

Ответ: –1 ± 3i.