Perform the indicated operations and write the result in standard form.
-$$( 6 + \sqrt { - 3 } ) ( 6 + \sqrt { - 7 } )$$
A) $15 - 12 \sqrt { 21 } \mathrm { i }$
B) $57 + 252 \mathrm { i }$
C) $( 36 + \sqrt { 21 } ) - 57 i$
D) $( 36 - \sqrt { 21 } ) + ( 6 \sqrt { 7 } + 6 \sqrt { 3 } ) i$

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The Answer of Perform the indicated operations and write the result in standard form.
-$$( 6 + \sqrt { - 3 } ) ( 6 + \sqrt { - 7 } )$$
A) $15 - 12 \sqrt { 21 } \mathrm { i }$
B) $57 + 252 \mathrm { i }$
C) $( 36 + \sqrt { 21 } ) - 57 i$
D) $( 36 - \sqrt { 21 } ) + ( 6 \sqrt { 7 } + 6 \sqrt { 3 } ) i$

Perform the Indicated Operations and Write the Result in Standard (6+−3)(6+−7)( 6 + \sqrt { - 3 } ) ( 6 + \sqrt { - 7 } )(6+−3​)(6+−7​)

Perform the Indicated Operations and Write the Result in Standard $( 6 + \sqrt { - 3 } ) ( 6 + \sqrt { - 7 } )$