Respuesta :

Answer:

27 x^21

Step-by-step explanation:

(3x^7)^3

We know that (ab)^c = a^c b^c

3^3  x^7^3

27 x^7^3

We know that a^b^c = a^(b*c)

27 x^(7*3)

27 x^21

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