Question

1. Решите уравнение:
y^3+3y^2-y-3=0
 

Answer 1

    метот группировки.....

Answer 2

y³+3y²-y-3=0

(y³+3y²)-(y+3)=0

(y³+3y²)-(y+3)=0

y²(y+3)-(y+3)=0

(y+3)(y²-1)=0

(y+3)(y-1)(y+1)=0

y1 = -3

y2 = 1

y3 = -1