Respuesta :

Yang100

Answer:

Step-by-step explanation:

7(n+2)-3(n+4)

7n+14-3n-12

7n-3n+14-12

4n+14-12

4n+2

2(2n+1)

2(m)

2m where m=2n+1.

Thus 7(n+2)-3(n+4) is always even.

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