Respuesta :

Answer:

3n(7n^3-5n+5n)

21n^3 -15n +15n

21n^4

Step-by-step explanation:

3n(7n^3-5n+5n)

21n^3 -15n +15n

21n^4

21n^4 - 15n^2 + 15n^2 = 21n^4