Using the maxima and minima of the function, produce upper and lower estimates of the integral
$I = \int\!\!\int_{\mathbf{D}} e^{9\,(x^{2} + y^{2})} dA$ where $\mathbf{D}$ is the circular disk: $x^{2} + y^{2} \leq 7$.

$\leq I \leq$

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