Question

in interval notation, when a value is included in the domain or range of a function, we use.
in interval notation, we represent an unbounded range extending infinitely in the positive or negative direction using.

Explanation:

For the first blank, in interval notation, square brackets [ ] are used when a value is included in the domain or range of a function. For the second blank, in interval notation, infinity symbols ($\infty$ for positive infinity and $-\infty$ for negative infinity) are used to represent an unbounded range extending infinitely in the positive or negative direction.

Answer:

1. Square brackets ([ ]).
2. Infinity symbols ($\infty$ or $-\infty$).