The condition of X corresponding to the point on the number axis whose distance from the origin is less than 8 is? A - 8

The condition of X corresponding to the point on the number axis whose distance from the origin is less than 8 is? A - 8

A -8

On the number axis, point x indicates which points are less than 3 away from the origin, so what is | x-3 | + | x + 3 |
On the number axis, point X represents those points whose distance from the origin is less than 3, so what is | x-3 | + | x + 3 |

Consider X in three cases

Given the eccentricity of ellipse x ^ 2 / A ^ 2 + y ^ 2 / b ^ 2 = 1 (a > b > 0) = 6 / 3, if the distance from the origin to the straight line x + y-b = 0 is √ 2,

C / a = √ 6 / 3
B / √ 2 = √ 2, B = 2
Then a & # 178; - C & # 178; = 4
The solution is: a = 2 √ 3, C = 2 √ 2
Therefore, the elliptic equation is: X & # 178 / 12 + Y & # 178 / 4 = 1