Answer:
3 (4 a - 3)
Step-by-step explanation:
Simplify the following:
3 a (3 - a) + 3 (a^2 - 3) + 3 a
3 a (3 - a) = 9 a - 3 a^2:
9 a - 3 a^2 + 3 (a^2 - 3) + 3 a
3 (a^2 - 3) = 3 a^2 - 9:
3 a^2 - 9 - 3 a^2 + 9 a + 3 a
Grouping like terms, 3 a^2 - 3 a^2 + 9 a + 3 a - 9 = (9 a + 3 a) - 9 + (-3 a^2 + 3 a^2):
(9 a + 3 a) - 9 + (-3 a^2 + 3 a^2)
9 a + 3 a = 12 a:
12 a - 9 + (-3 a^2 + 3 a^2)
3 a^2 - 3 a^2 = 0:
12 a - 9
Factor 3 out of 12 a - 9:
Answer: 3 (4 a - 3)
