You would factor 3a + 9b as:
3(a+3b)
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(x + 3)(a + b)
(2a+1)(a+1)
7a minus 2, if "3a-2" means 3a minus 2. 3a plus 1 and 1-3rd in parenthesis times 3a, if "3a-2" means 3a squared. a plus 3a squared plus 3a = 1-3rd times 3a plus 3a times 3a plus 1 times 3a = 3a plus 1 and 1-3rd in parenthesis times 3a
3a(b+c)+2b(b+c)
2a+3a=5a