To simplify the expression \(5^{23} \cdot 5^{15}\), we can use the product property of exponents, which states that when multiplying two powers with the same base, you add the exponents. Therefore, the expression simplifies to \(5^{23+15}\).
Step 1: Apply the Product Property of Exponents
To simplify the expression \(5^{23} \cdot 5^{15}\), we use the product property of exponents, which states:
\[
a^m \cdot a^n = a^{m+n}
\]
Thus, we can rewrite the expression as:
\[
5^{23} \cdot 5^{15} = 5^{23 + 15} = 5^{38}
\]
Step 2: Calculate the Value of \(5^{38}\)
Next, we compute the value of \(5^{38}\). The result of this calculation is:
\[
5^{38} = 363797880709171295166015625
\]
Final Answer
The simplified expression \(5^{23} \cdot 5^{15}\) evaluates to:
\[
\boxed{363797880709171295166015625}
\]