Write the value of $\sqrt{-25} \times \sqrt{-9}$.
$\sqrt{-25} \times \sqrt{-9}=5 \sqrt{-1} \times 3 \sqrt{-1}$
$=5 i \times 3 i$
$=15 i^{2}$
$=-15$
Hence, $\sqrt{-25} \times \sqrt{-9}=-15$.
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