Please see, f(x) is read is function f of x.
Where x is the input variable and function f(x) gives output value of function for x input value.
For the given function, we have f(3).
If we compare f(3) by f(x), the x represented by input value 3.
Therefore, x value is 3 there.
And we also have f(x) =-5.
Because function value is -5. So we can read it as, "for x input value of the the function gives output value -5."
For the asked value of x is just x=3.
The interpretation of the function written above is the value of the function, f(x) when x = 3.
Function written as f(x) can be interpreted as the value of the function, f(x) when the value of x = 3
Therefore, the function, f(3) = - 5 means the value of the defined function when the value of x = 3.
Therefore, the value of x in the statement given is 3, thus the value of the function at x = 3 is -5.
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