4 - -1
What you need to do is change the subtracting sign to addition and flip -1 into +1. So it should look like:
4+1 and 4+1 equals 5
4+1=5
4 - -1
What you need to do is change the subtracting sign to addition and flip -1 into +1. So it should look like:
4+1 and 4+1 equals 5
4+1=5