Question

Решите уравнение (4y+6)*(1,8-0,2y)=0

Answer 1

(4y+6)(1.8-0.2y)=0
7.2y-0.8y²+10.8-1.2y=0
-0.8y²+6y+10.8=0
D=36-4*(-0.8)*10.8=70.56
y1=(-6+8.4)/(-1.6)=-1.5
y2=(-6-8.4)/(-1.6)=9