### Instruction: What is the value of $f(-1)$ if $f(x)=x^{2}-2x$?### Response: To find the value of $f(-1)$, I need to plug in $-1$ for $x$ in the function definition and simplify.
So, $f(-1)=(-1)^{2}-2(-1)$.
This is equal to $1+2=3$.