Explanation :
Move one stick from '4' and shift it to a - sign, which becomes +.
Next,create '4 into 7, as shown in the below image.
The correct equation will get 7+1=8.
Matchstick Image : Sloved Answer 4-1=8 Matchstick Puzzle
Matchstick Image : Answer 4-1=8 Matchstick Puzzle