Answer:
Answer 21ab
Explanation:
First you do 3 times 3a which you get 9a then to 3 times 4b and you get 12b. So 12b plus 9a equals 21ab
9a+12b
use the distributive property
since the three is on the outside of the parethesis distribute it
3x3a= 9a
then do the same with 4b
3x4b= 12b
final answer
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