F (x) = ㏒ {[x power of 1 + 2 + x power of 3 + The x power of + (n-1) + the x power of n × a] / N}, a is a real number , n is any given positive natural number and N ≥ 2, if f (x) is meaningful when x ∈ (- ∞, 1], the value range of a is obtained

First of all, what is the base of log? 10? Suppose it has nothing to do with the base. According to my understanding, the topic is to find the value of a that makes f (x) meaningful. That is, to find the value of a that makes the value in the big bracket positive within the value range of X. then what is the meaning of the "/ N" (n of denominator) outside the middle bracket? The topic says n > 0, so it doesn't

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