The value of f(-1) in the graph is 1
How to determine the value of f(-1)
From the graph, we have the following observation:
When x = -1, the values of f(-1) are -1 and -3
However, at f(-1) = -1, the function has a closed circle.
At f(-1) = -3, the function has an open circle.
The closed circle means inclusive values.
So, the value of f(-1) in the graph is 1
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