Solve Equations That Are Quadratic in Form
Solve the Equation $$x ^ { 4 } - 4 x ^ { 2 } + 3 = 0$$

Multiple Choice

Solve Equations That Are Quadratic in Form
Solve the equation by making an appropriate substitution.
- $$x ^ { 4 } - 4 x ^ { 2 } + 3 = 0$$

A) $\{ - 1,1 , - \sqrt { 3 } , \sqrt { 3 } \}$
B) $\{ - 1,1 , - \mathrm { i } \sqrt { 3 } , \mathrm { i } \sqrt { 3 } \}$
C) $\{ 1,3 \}$
D) $\{ 1 , \sqrt { 3 } \}$