40 9 - 7x - 13 x2 = - 7x - 10x²- 4

Преобразуем уравнение:

$$ 9 - 7x - 13x^2 = -7x - 10x^2 - 4 $$

$$ -3x^2 = -13 $$

$$ x^2 = \frac{13}{3} $$

$$ x_1 = \sqrt{\frac{13}{3}} = \frac{\sqrt{39}}{3} $$

$$ x_2 = -\sqrt{\frac{13}{3}} = -\frac{\sqrt{39}}{3} $$

Ответ: $$ x_1 = \frac{\sqrt{39}}{3}, x_2 = -\frac{\sqrt{39}}{3} $$