Answer
The zeroes of $ f $ are $\underline{-1,1}$.
Work Step by Step
We know that the value of x that makes the output of f zero is known as the zero of a function.
Generally, the zero of the function is a coordinate or point of the graph of the function that crosses the $ x-$ axis.
Therefore, the graph crosses the $ x-$ axis at the coordinates $ x=-1$ and $ x=1$.
Hence, the zeroes of $ f $ are $ x=\underline{-1}$ and $ x=\underline{1}$.
