I have a method that gets a single string and returns it as either (lets say)

```
s = "+8.7x^2+6x+3"   
//OR
s = "-8.7x^2+6x+3"

```

How do I format this string so that it removes the positive sign if the first term of the string is positive `(s.charAt(0))`, but it doesn't remove the negative sign if the first term is negative?

I want to use `s.subString()` and/or `s.charAt()` if that's possible.