y^2+17y+42=0
За Т. Виета:
y1+y2=-17
y1*y2=42
y1=-3
y2=-14
y1= - 14
y2= - 3
Объяснение:
y²+17y+42=0
y²+14y+3y+42=0
y×(y+14)+3(y+14)=0
(y+14)×(y+3)=0
y+14=0
y+3=0
y=-14
y=-3
