Решите (12у+18)(1,6-0,2у)=0

Question

Решите (12у+18)(1,6-0,2у)=0

Answer 1

(12у+18)(1,6-0,2у)=0
19.2y-2.4y²+28.8-3.6y=0
2.4y²+15.6y-28.8=0
D=b²-4ac=243.6+276.8=519.84 √519.84=22.8
x1=-b-√D/2a=15.6-22.8/4.8=-1.5
x2=-b+√D/2a=15.6+22.8/4.8=8