ответ: -1; -0.4; 1.
Объяснение:
5x^3 + 2x^2 - 5x - 2 = 0
x^2 (5x+2) - (5x+2) = 0
(5x+2) (x^2 - 1) = 0
(5x+2) (x-1) (x+1) = 0
x1 = -0.4
x2 = -1
x3 = 1
Объяснение:
5x³+2x²=5x+2
x²×(5x+2)=5x+2
x²×(5x+2)-(5x+2)=0
(5x+2)×(x²-1)=0
5x+2=0
x²-1=0
x=-2/5
x=-1
x=1
