Question

(12y+18)(1.6-0.2y)=0

Answer 1

y=-18/12=-1.5(1 скобка)
y=1.6/0.2=8(2 скобка)

Answer 2

(12y+18)(1,6-0,2y)=0
19,2y-2,4y²+28,8-3,6y=0
-2,4y²+15,6y+28,8=0 /(-1)
 2,4y²-15,6y-28,8=0
D=243,36+276,48=519,84
y₁= (15,6+22,8)/4,8=38,4/4,8=8.
y₂= (15,6-22,8)/4,8= -7,2/4,8= -1,5.