Add or subtract.
-$( \sqrt { 80 } - \sqrt { - 80 } ) + ( 4 \sqrt { 5 } + \sqrt { - 320 } )$
A) $8 \sqrt { 5 } + 4 \sqrt { 5 }$
B) $8 \sqrt { 5 } - 4 \mathrm { i } \sqrt { 5 }$
C) $8 \sqrt { 5 } + 4 i \sqrt { 5 }$
D) $8 \sqrt { 5 } + 12 i \sqrt { 5 }$

Question

Quizplus · Accepted Answer

The expression simplifies to $8 \sqrt{5} + 4i \sqrt{5}$ by simplifying $\sqrt{80} = 4\sqrt{5}$, $\sqrt{-80} = 4i\sqrt{5}$, and $\sqrt{-320} = 8i\sqrt{5}$.

Add or Subtract (80−−80)+(45+−320)( \sqrt { 80 } - \sqrt { - 80 } ) + ( 4 \sqrt { 5 } + \sqrt { - 320 } )(80​−−80​)+(45​+−320​)

Add or Subtract $( \sqrt { 80 } - \sqrt { - 80 } ) + ( 4 \sqrt { 5 } + \sqrt { - 320 } )$