Answer:
f(-3) = 4
Domain: (-infinity, 4), Range: (-infinity, 4]
Step By Step Solution:
Value of f(-3):
Looking at the graph, at x = -3, there is a jump discontinuity, and there appears to be two values that f(-3) can equal.
At x = -3, from the left side, there is a closed circle at y = 4, and from the right side, there is an open circle at y = 3.
A closed circle denotes that the point IS included in the function, while an open circle denotes the point is NOT included in the function and that point is undefined.
Therefore, the value of f(-3) is 4, because (-3, 4) is included in the function.
Domain and range:
The domain represents the set of all x-values that exist for the function.
In this case, we can see that the function continues off the graph on the left side, meaning it continues on to -infinity. We see a jump discontinuity at x = -3, however, because f(-3) is defined, this will not affect the domain. The function continues to the right until x = 4, where there is an open circle.
An open circle denotes undefined, x = 4 is not included in the domain.
Putting everything together, the domain is:
D: (-infinity, 4)
* Note we used a parenthesis after 4. Parenthesis denote that 4 is not included in the answer, whereas a bracket denotes that 4 would be included. Parenthesis are used for infinity and -infinity due to there not being a defined answer for what infinity is, so we would not use a bracket for infinity.
The range represents the set of all y-values that exist for the function.
In this case, we can see on the left side that the function continues downwards, and approaches negative infinity. We can see there is a jump discontinuity when x = -3, and that there is an undefined point at y = 3. We can, however, see that at around x = -4, that y = 3 IS defined there, so this will not affect our range. We can see the highest point is y = 4, which has a closed circle, meaning it is included in the range.
Putting everything together, the range is:
R: (-infinity, 4]
* Note that this time, a bracket IS used. This is because y = 4 IS defined and included in the function's range