To determine the value of [tex]\( p \)[/tex] for the given series, we start with the series:
[tex]\[
\sum_{n=1}^{\infty} n^2 \left( 4^{-3 \ln(n)} \right)
\][/tex]
We can use the exponentiation property [tex]\( a^{\log_b(x)} = x^{\log_b(a)} \)[/tex] to simplify the expression inside the sum.
First, let's deal with the term [tex]\( 4^{-3 \ln(n)} \)[/tex]. We can rewrite 4 as [tex]\( 2^2 \)[/tex], so we have:
[tex]\[
4^{-3 \ln(n)} = (2^2)^{-3 \ln(n)}
\][/tex]
This can be simplified further. Using the power rule for exponents:
[tex]\[
(2^2)^{-3 \ln(n)} = 2^{2 \cdot (-3 \ln(n))} = 2^{-6 \ln(n)}
\][/tex]
Next, we take advantage of the property of exponents involving logarithms. Recall that [tex]\( 2^{-6 \ln(n)} = n^{\log_2(2^{-6})} \)[/tex]. Therefore:
[tex]\[
2^{-6 \ln(n)} = n^{-6 \ln(2)}
\][/tex]
Since [tex]\( \ln(2) \)[/tex] is a constant, this can be interpreted as:
[tex]\[
2^{-6 \ln(n)} = n^{-6}
\][/tex]
Hence, our original series now looks like:
[tex]\[
\sum_{n=1}^{\infty} n^2 \cdot n^{-6}
\][/tex]
We can combine the exponents for [tex]\( n \)[/tex]:
[tex]\[
n^2 \cdot n^{-6} = n^{2 + (-6)} = n^{-4}
\][/tex]
So our series is now:
[tex]\[
\sum_{n=1}^{\infty} n^{-4}
\][/tex]
This matches the form of a [tex]\( p \)[/tex]-series [tex]\(\sum_{n=1}^{\infty} \frac{1}{n^p}\)[/tex], where [tex]\( p = 4 \)[/tex].
So, the value of [tex]\( p \)[/tex] is:
[tex]\[
p = 4
\][/tex]
