Question

Спростіть вираз:
-9y(y-3)+4.5y(2y-4)

Answer 1

$- 9y(y - 3) + 4.5y(2y - 4) = \\ = - 9 {y}^{2} + 27y + 9 {y}^{2} - 18 = \\ = 27y - 18 = 9(3y - 2)$