The value of $\sqrt{-25} \times \sqrt{-9}$ is _________________
$\sqrt{-25} \times \sqrt{-9}$
$=5 i \times 3 i \quad(\because \sqrt{-1}=i)$
$=15 i^{2}$
$=-15$
value of $\sqrt{-25} \times \sqrt{-9}$ is $-15$
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