I apologize for any confusion in my previous responses. Let's clarify the expression you provided: \( \sqrt{23}^4 \).
We can express \( \sqrt{23} \) as \( 23^{1/2} \). Thus, when we have \( \sqrt{23}^4 \), it can be rewritten using a rational exponent as follows:
\[
\sqrt{23}^4 = (23^{1/2})^4
\]
Now, applying the rule of exponents \((a^m)^n = a^{m \cdot n}\):
\[
(23^{1/2})^4 = 23^{(1/2) \cdot 4} = 23^{2}
\]
However, you asked for a rational number that could be used as an exponent to rewrite \( \sqrt{23}^4 \). From the steps above, we used the exponent:
\[
\frac{4}{2} = 2
\]
Thus, to rewrite \( \sqrt{23}^4 \), the rational exponent used is \( 2 \) when simplified.
If you meant something different by "23−−√4," please let me know, and I can adjust my response accordingly. Thank you for your patience!