Solve the Equation by Making an Appropriate Substitution $$x ^ { 4 } - 2 x ^ { 2 } - 8 = 0$$

question 88

Multiple Choice

Solve the equation by making an appropriate substitution.
- $$x ^ { 4 } - 2 x ^ { 2 } - 8 = 0$$

• A) \(\{ 2 , i \sqrt { 2 } \}\)
• B) \(\{ - 4,2 \}\)
• C) \(\{ - 2,2 , - \mathrm { i } \sqrt { 2 } , \mathrm { i } \sqrt { 2 } \}\)
• D) \(\{ - \sqrt { 2 } , \sqrt { 2 } , - 2 i , 2 i \}\)

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