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To solve the equation \( xx - 9 = 15 \), let's first rewrite it correctly. Assuming "xx" means \( x^2 \), the equation becomes:
\[
x^2 - 9 = 15
\]
Now, let's simplify the equation:
1. Add 9 to both sides:
\[
x^2 = 15 + 9
\]
\[
x^2 = 24
\]
2. Now, take the square root of both sides:
\[
x = \pm \sqrt{24}
\]
We can simplify \( \sqrt{24} \):
\[
\sqrt{24} = \sqrt{4 \cdot 6} = 2 \sqrt{6}
\]
So the solutions are:
\[
x = 2 \sqrt{6} \quad \text{and} \quad x = -2 \sqrt{6}
\]
Thus, the possible solutions in approximate decimal form are \( x \approx 4.899 \) and \( x \approx -4.899 \).
Since the options listed (x = 24, x = 6, x = -24, x = -6) do not match our results, it appears there was a misinterpretation of "xx." If there is any correction or more details, please provide!