To evaluate the expression \( x^2y^2 \) for \( x = 3 \) and \( y = 3 \), we can follow these steps:
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Substitute the values of \( x \) and \( y \) into the expression:
\[ x^2y^2 = (3^2)(3^2) \]
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Calculate \( 3^2 \):
\[ 3^2 = 9 \]
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Substitute \( 9 \) back into the expression:
\[ (3^2)(3^2) = 9 \times 9 \]
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Calculate \( 9 \times 9 \):
\[ 9 \times 9 = 81 \]
Therefore, the value of the expression \( x^2y^2 \) at \( x = 3 \) and \( y = 3 \) is \( \boxed{81} \).