Задание 1.A1

Question

Решите уравнение $3x^2 + 8x - 3 = 0$.
ewline A) $-\frac{1}{3}; 3$;  Б) $-3; \frac{1}{3}$  B) $-9; 1$  Г) $-1; 9$

Gimli · Accepted Answer

$$3x^2 + 8x - 3 = 0$$
$$D = b^2 - 4ac = 8^2 + 3	imes 3	imes 4 = 64 + 36 = 100 = 10^2 > 0$$
$$x_1 = \frac{-b + \sqrt{D}}{2a} = \frac{-8 + 10}{6} = \frac{2}{6} = \frac{1}{3}$$
$$x_2 = \frac{-b - \sqrt{D}}{2a} = \frac{-8 - 10}{6} = \frac{-18}{6} = -3$$
$$x = {\frac{1}{3}; -3}$$
ewline	extbf{Ответ: Б) $-3; \frac{1}{3}$.}

Задание 1.A1

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Задание 1.A1

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