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$4 i$
Calculate the value
$\sqrt{ \color{#FF6800}{ - } \color{#FF6800}{ 16 } }$
$ $ Organize the part that can be taken out of the radical sign inside the square root symbol $ $
$\color{#FF6800}{ 4 } \sqrt{ \color{#FF6800}{ - } \color{#FF6800}{ 1 } }$
$4 \sqrt{ \color{#FF6800}{ - } \color{#FF6800}{ 1 } }$
$ $ It is $ \sqrt{-1} = i$
$4 \color{#FF6800}{ i }$
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