1. What are the other names for an index ?
An index is sometimes called a power or exponent.
2. What is the value of x1?
The value of x1 is x.
The value of any number or variable to the power of 1 is equal to the number or variable itself.
3. Is it possible to have a negative index?
Yes. A negative index involves taking the reciprocal of the variable. e.g. x−4 = 1⁄x4.
This is normally studied in more detail in later years.