Expanding the expression, we get:
(a + 6)^2 = a^2 + 12a + 36
Expanding the second part of the expression, we get:
-2a(3 - 2a) = -6a + 4a^2
Combining the terms, we get:
a^2 + 12a + 36 - 6a + 4a^2
Rearranging the terms, we get the final answer:
5a^2 + 6a + 36
Expanding the expression, we get:
(a + 6)^2 = a^2 + 12a + 36
Expanding the second part of the expression, we get:
-2a(3 - 2a) = -6a + 4a^2
Combining the terms, we get:
a^2 + 12a + 36 - 6a + 4a^2
Rearranging the terms, we get the final answer:
5a^2 + 6a + 36