finding the value of these given inputs
You don't need to find the value of those inputs. They are given to you.
I believe there's no way to solve it since the function is not given …
Actually, the function
is given.
A function may be given by a formula, by a graph, by a table of values, or by describing it in words.
… I have no idea how to find the function with this graph …
You're not asked to find the function.
You're asked:
When x is -4, what is y?
When x is 1, what is y?
When x is 3, what is y?
When x is 5, what is y?
These answers can be read from the graph.
The symbol f(x) is function notation; it's just another way to write y. In other words, the symbol f(x) represents the function's output
variable.
When the input
variable x is assigned a
constant value, like x=-4, then the symbol f(-4) represents a
constant. It's the value of y, when x is -4.
If you're not sure what I'm talking about in this post, then you may need to consider dropping calculus and retaking pre-calculus (or maybe even intermediate algebra), in order to relearn the material that you've forgotten. My suggestion: speak with your instructor, and ask for advice. Cheers :cool: