It is 3a^2 which means 3a squared
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
a2+3a-10 = (a-2)(a+5) when factored
3a squared b squared
3a squared plus nine = 19a. 3a to the second power = 9a plus 9 = 19a.
3a squared b