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Perform the Indicated Operation $( \sqrt { 7 } + 5 \mathrm { i } ) ( \sqrt { 7 } - 5 \mathrm { i } )$

Question 257

Multiple Choice

Perform the indicated operation. Write the result in the form a + bi.
- $( \sqrt { 7 } + 5 \mathrm { i } ) ( \sqrt { 7 } - 5 \mathrm { i } )$

A) $7 - 2 i \sqrt { 5 }$
B) $7 - 25 \mathrm { i }$
C) $- 18 + 0 \mathrm { i }$
D) $32 + 0 \mathrm { i }$

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