Find the Sum or Difference $\mathrm { i } \sqrt { 5 } + 1 - ( 7 + 8 \mathrm { i } \sqrt { 5 } ) - ( 6 - \mathrm { i } \sqrt { 5 } )$

Find the sum or difference. Write the answer in standard form.
- $\mathrm { i } \sqrt { 5 } + 1 - ( 7 + 8 \mathrm { i } \sqrt { 5 } ) - ( 6 - \mathrm { i } \sqrt { 5 } )$

A) $12 - 10 \mathrm { i } \sqrt { 5 }$
B) $- 12 - 6 i \sqrt { 5 }$
C) $- 12 + 6 i \sqrt { 5 }$
D) $- 12 - 10 \mathrm { i } \sqrt { 5 }$

Correct Answer:

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