Let u = R, a = {x | A-2 less than or equal to x, less than or equal to a + 10} B = {x-3 less than or equal to 6 If Au (cub) = R, find the range of A

Let u = R, a = {x | A-2 less than or equal to x, less than or equal to a + 10} B = {x-3 less than or equal to 6 If Au (cub) = R, find the range of A


Let u = R, a = {x | A-2 ≤ X6 or X ≤ - 3}
If Au (cub) = R,
It needs to meet the following requirements:
A-2 ≤ - 3 and a + 10 > 6
Get - 4