For what real values of a is the expression (a + 3)/((a^2 - 4)(a + 3)) undefined? List your answers in increasing order separated by commas.
Undefined means the denominator is 0.
So \((a^2 - 4)(a + 3) = 0\).
We can factor \((a^2 - 4) \), which is equal to \((a + 2)(a - 2)\), so (a^2 - 4)(a + 3) = \((a + 2)(a - 2)(a + 3)\) = 0, so a = -2, 2, -3
\(a = (-3, -2, 2)\)
