Solved

Solve
- $x ^ { 4 } - 30 x ^ { 2 } = 216$

Question 77

Multiple Choice

Solve.
- $x ^ { 4 } - 30 x ^ { 2 } = 216$

A) $- 6,6 , - i \sqrt { 6 } , i \sqrt { 6 }$
B) $- \sqrt { 6 } , \sqrt { 6 } , - 6 i , 6 i$ ,
C) $6 , \mathrm { i } \sqrt { 6 }$
D) $- 36,6$

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