Respuesta :

Rule: log(x^y) = y*log(x)
This rule basically allows us to pull the exponent down

Using that rule, we can say
8*log(x^7) = 8*7*log(x) = 56*log(x)
where in this case the base is 3

So the answer that goes in the box is 56
That would be 7*8 log3 x

the number to go in the box ix 56

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