Answer
-2; The denominator is 0 when m=-2
Work Step by Step
Factor out a -2 in the numerator, which then switches the signs of the arguments.
$\frac{-2(4-2m)}{4-2m}$
Divide the numerator and denominator by the common factor 4-2m.
$\frac{-2(4-2m)}{4-2m}$ $\div$ $\frac{4-2m}{4-2m}$ = -2
