To solve the problem, we need to find the correct representation for the expression \( 5 = 7^{\log_7 5} \).
1. Understanding Logarithmic Properties:
We can use the property of logarithms which states:
\[
a^{\log_a b} = b
\]
This property implies that \( 7^{\log_7 5} = 5 \), because the base and the logarithm's base are the same.
2. Verifying the Options:
The given equation \( 5 = 7^{\log_7 5} \) corresponds exactly to Option (3):
\[
7^{\log_7 5}
\]
Final Answer:
The correct option is Option C: \( 7^{\log_7 5} \).
The product of all solutions of the equation \(e^{5(\log_e x)^2 + 3 = x^8, x > 0}\) , is :