-4(y+5)(+12-y) упростите (1/5x-9/10)+(7/10x-4/5)

Question

-4(y+5)(+12-y) упростите
(1/5x-9/10)+(7/10x-4/5)

Answer 1

-4(y+5)(+12-y) = -48y + 4y^2 - 240 + 20y = 4y^2 - 28y - 240 = 4(y^2 - 7y - 60)
(1/5x-9/10)+(7/10x-4/5) = 1/5x - 9/10 + 7/10x - 4/5 = 9/10x - 17/10 = 1/10(9x - 17)