f(-1) + f(0) = (-4)*(-1) + 1 + (-4)*0 + 1 = 5 + 1 = 6
X²-3x+19x-57-2x-1-x+38≥0
x²+13x-19≥0
D=169+76=245
x1=(-13-7√5)/2 U x2=(-13+7√5)/2
x∈(-∞;(-13-7√5)/2] U [(-13+7√5)/2;∞)
6ху - 2х² - (3ху + 4х² + 1) - (-ху - 2х² - 1) =
6ху -2х² - 3ху - 4х² - 1 + 2х² + ху +1 = 5ху - 6х²
4ax²-4-9a-9x=0
4ax²-9x-(4+9a)=0
D=81+16(4+9a)=81+64+144a=145+144a<0
144a<-145
a<-145:144
a<-145/144
a∈(-∞;-145/144)