D = [-6;1,5].
Объяснение:
y = √(18-9х -2х^2)
18-9х -2х^2≥0
2х^2 + 9x - 18 ≤ 0
D = 81 - 4•2•(-18) = 81 + 144 = 225;
x1 = (-9+15):4= 1,5;
x2 = (-9-15):4= -6.
2•(x - 1,5)•(x + 6)≤ 0
(x - 1,5)•(x + 6)≤ 0
_+_[-6]_-_[1,5]_+___
x ∈ [-6;1,5].
