Try the following GMAT Problem Solving question on conditions under which algebraic expressions are undefined.
Question 51:
For what real values of $x$ is the expression $\dfrac{3(x+3)}{(x1)(x+2)}$ not defined ?

$\quad x=3 \; \textrm{only}$

$\quad x=2 \; \textrm{only}$

$\quad x=1 \; \textrm{only}$

$\quad x=2 \; \textrm{or} \; 1 \; \textrm{only}$

$\quad x=3, 2, \textrm{or} \; 1 $
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