\[(a + 3)(a - \ *) = \ *\ + \ a - 6\]
\[a² - a \cdot \ *\ + 3a - 3 \cdot \ *\ = \ *\ + \ a - 6\]
\[*\ = 2:\]
\[a^{2} - 2a + 3a - 3 \cdot 2 = a^{2} + a - 6\]
\[(a + 3)(a - 2) = a^{2} + a - 6.\]