Question

Ребят помогите срочно
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Answer 1

Ответ:

(12у+18)(1.6-0.2у)=0;

$19.2y - 2.4 {y}^{2} + 28.8 - 3.6y = 0 \\ - 2.4 {y}^{2} + 15.6y + 28.8 = 0 \\ 2.4 {y}^{2} - 15.6y - 28.8 = 0 \\ {y }^{2} - 6.5y - 12 = 0 \\ d = 90.25 \\ y1 = \frac{6.5 - 9.5}{2} = - 1.5 \\ y2 = \frac{6.5 + 9.5}{2} = 8$