Specific the domain of each variable.

1. x + x^(-1)

Clearly, x is the only variable. We can write question 1 like this: x + 1/x. Is this right?

I will say that x can be any number except 0.

So, the domain is ALL REAL NUMBERS EXCEPT 0 since zero in the denominator of a fraction does not exist. Is this correct?

2. t^(-1) + 2t^(-2)

Question 2 can be written as (1/t) + 2/(t^2). Correct?

Clearly t is the only variable. I know that t can be any number except zero.

In conclusion, the domain is ALL REAL NUMBERS EXCEPT FOR 0. Is this right?