Evaluate the Expression $1 + \frac { \sqrt { - 36 } \cdot \sqrt { - 49 } i } { \sqrt { 21 } }$

question 120

Multiple Choice

Evaluate the expression $1 + \frac { \sqrt { - 36 } \cdot \sqrt { - 49 } i } { \sqrt { 21 } }$ and write the result in the form $a + b i$ .

• A) \(\sqrt { 21 } - 42 i\)
• B) \(21 - 42 i\)
• C) \(1 - 2 i \sqrt { 21 }\)
• D) \(- \sqrt { 21 } + 42\)
• E) \(- \sqrt { 21 } - 42 i\)

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