Question

Помогите пожалуйста

Answer 1

$2.5x^3 - 2.5x^2 - 30x = 0\2.5x(x^2 - x - 12) = 0\x = 0\x^2 - x - 12 = 0\D = 49\x_1 = 4; x_2 = -3\x = -3; x=0; x=4$