Question

помогите решить -2x(x+4)+5(x2-3x)

Answer 1

Ответ:

$- 2x(x + 4) + 5(x^{2} - 3x) = 0\\ - 2x {}^{2} - 8x + 5x {}^{2} - 15x = 0\\ 3x {}^{2} - 23x = 0 \\ x(3x - 23) = 0 \\ x = 0 \\ 3x - 23 = 0 \\ x = \frac{23}{3}$