Question

Помогите решить
3х^2=х+4

Answer 1

Ответ:

${3x}^{2} = x + 4 \\ {3x}^{2} - x - 4 = 0 \\ d = {b }^{2} - 4ac = 1 - 4 \times 3 \times ( - 4) = 49 \\ x = \frac{ { - b}{} - \sqrt{d} }{2a} = \frac{1 - 7}{6} = - \frac{6}{6} = - 1 \\ x = \frac{ - b + \sqrt{d} }{2a} = \frac{1 + 7}{6} = \frac{8}{6} = \frac{4}{3} = 1 \frac{1}{3}$