Question

8y2−8y(y+5)≤100 .....

Answer 1

$8 {y}^{2} - 8 {y}^{2} - 40y \leqslant 100 \\ - 40y \leqslant 100 \\ y \geqslant 100 \div ( - 40) \\ y \geqslant - 2.5$