Do you have a picture I can use for reference?
We have the expression:

When we have rational functions, where the denominator is a function of x, we have a restriction for the domain for any value of x that makes the denominator equal to 0.
That is because if the denominator is 0, then we have a function f(x) that is a division by zero and is undefined.
If we have a value that makes f(x) to be undefined, then this value of x does not belong to the domain of f(x).
Expression:

Answer: There is no restriction for x in the expression.
Answer:
17.
Step-by-step explanation:
f(x) = 2x^2 - 1
f(-3) = 2(-3)^2 - 1
= 2 * 9 - 1
= 18 - 1
= 17
Hope this helps!
28x - 2 = 26x + 6
2x = 8
x = 4
Answer:
1 week= 7 days
number of days= 9
number of weeks= 1 week and 2 days
<em>hope it helps :)</em>
<em>please mark it the brainliest!</em>