Combine $( 9 + \sqrt { - 3 } ) ( 8 - \sqrt { - 21 } )$ and write the answer in standard form.
A) $72 + 3 \sqrt { 7 } i$
B) $( 72 + 3 \sqrt { 7 } ) + ( 8 \sqrt { 3 } - 9 \sqrt { 21 } ) i$
C) $8 \sqrt { 3 } - 3 \sqrt { 7 } i$
D) $( 8 \sqrt { 3 } + 3 \sqrt { 7 } ) + ( 72 - 9 \sqrt { 7 } ) i$
E) $3 \sqrt { 7 } - 8 \sqrt { 3 } i$

Question

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The Answer of Combine $( 9 + \sqrt { - 3 } ) ( 8 - \sqrt { - 21 } )$ and write the answer in standard form.
A) $72 + 3 \sqrt { 7 } i$
B) $( 72 + 3 \sqrt { 7 } ) + ( 8 \sqrt { 3 } - 9 \sqrt { 21 } ) i$
C) $8 \sqrt { 3 } - 3 \sqrt { 7 } i$
D) $( 8 \sqrt { 3 } + 3 \sqrt { 7 } ) + ( 72 - 9 \sqrt { 7 } ) i$
E) $3 \sqrt { 7 } - 8 \sqrt { 3 } i$

Combine (9+−3)(8−−21)( 9 + \sqrt { - 3 } ) ( 8 - \sqrt { - 21 } )(9+−3​)(8−−21​)

Combine $( 9 + \sqrt { - 3 } ) ( 8 - \sqrt { - 21 } )$