Question

Simply, please. cuz i cant get it myself. lol

Answer 1

well there might me an answer either u can put 21x +28 or 14x, but go with 21x + 28

Explanation:

you multiply 3x time 7 and 4 times 7 since u cant add 3x plus 4 and to separate it to get a simpler expression

Answer 2

21x + 28

Explanation:

open the bracket

=21x + 4