Answer:
f(x) is equal to -1 when x=3
Explanation:
we have
![y=f(x)=-1](https://img.qammunity.org/2020/formulas/mathematics/high-school/ugq0ox32ichh25e31xrfqbbv9zixddrc8x.png)
This is a constant function
we know that
A constant function is a function whose output value is the same for every input value
therefore
when x=3 (input value)
The value of the function is y=-1 (output value)