Sample quiz on function evaluation
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1. If $y=f(x)$, what does $f(3)$ mean?
   
   the value of $x$ when $y=3$
   the value of $3x$ when $y=3$
   the value of $y$ when $x=3$
   the value of $3y$ when $x=3$
   
2. Evaluate $f(2)$, given that $f(x)=x^2-2x$
   
   $0$
   $2$
   $4$
   $-2$
3. Evaluate $f(-1)$, given that $f(x)=\sqrt{-x}$
   
   undefined
   $-1$
   $0$
   $1$
4. Evaluate $f(-1)$, given that $f(x)=\sqrt{x}$.
   
   undefined
   $-1$
   $0$
   $1$
5. Evaluate $f(-2)$, given that $f(x)=\frac{x-2}{x+1}$
   
   $-4$
   $-2$
   $4$
   $2$
6. Given $f(x)=|x-1|$, evaluate $f(-3)$.
   
   $4$
   $3$
   $-3$
   $-4$
7. Given $f(x)=x^2+2x-3$, find the value(s) of $x$ for which $f(x)=0$.
   
   $x=-1$
   $x=-1,3$
   $x=-3,1$
   $x=-3$
8. If $f(0)$ is defined for an arbitrary function $f(x)$, what is its geometrical interpretation?
   
   the maximum value in its graph
   the minimum value in its graph
   the $x$-intercept(s) of its graph
   the $y$-intercept of its graph
9. For which of the following equations is $f(0)$ defined?
   
   $f(x)=\sqrt{x}$
   $f(x)=x^2$
   $f(x)=|x|$
   All of the above
10. Evaluate $f(a)$, given that $f(x)=x^2-ax+a$
    
    $2a^2$
    $2a$
    $a$
    $0$