Question

7j+3-4j+9What us the answer to this problem

Answer 1

3j +12 is the answer to the question, just add like terms.

Answer 2

7j - 4j = 3j 

 3 + 9=  12 

→Therefore, your answer would change to : 3j + 12 

Or , you can put 3(J) + 12 :)

Just combine your like terms