Answer is the third option that includes the points at -2 and 2
Step by step
|-2x|=4
the absolute sign means we have to solve for both positive and negative
-2x = 4 and - -2x = 4
-2x = 4
-2/-2 x = 4/-2
x = -2
- -2x = 4 (two negatives makes a positive)
2x =4
2/2 x = 4/2
x = 2