Question

решите уравнение
5$x^{3}$ - 15$x^{2}$ - х + 3 = 0

Answer 1

$5 x^{3} - 15 x^{2} - х + 3 = 0 \ 5 x^2(x - 3) - (х-3 )= 0 \ (x-3)(5x^2-1)=0 \ x-3=0 \ x=3 \ 5x^2-1=0 \ 5x^2=1 \ x^2=0.2 \ xpm sqrt{0.2}$
Ответ: $3; pm sqrt{0.2}$