Solve.
-$x ^ { 4 } - 4 x ^ { 2 } - 45 = 0$
A) $\{ 3 , i \sqrt { 5 } \}$
B) $\{ - \sqrt { 5 } , \sqrt { 5 } , - 3 i , 3 i \}$
C) $\{ - 9,5 \}$
D) $\{ - 3,3 , - \mathrm { i } \sqrt { 5 } , \mathrm { i } \sqrt { 5 } \}$

Question

Quizplus · Accepted Answer

The equation can be factored as $(x^2 - 9)(x^2 + 5) = 0$, giving roots $x = \pm 3$ and $x = \pm i\sqrt{5}$.

Solve - x4−4x2−45=0x ^ { 4 } - 4 x ^ { 2 } - 45 = 0x4−4x2−45=0

Solve
- $x ^ { 4 } - 4 x ^ { 2 } - 45 = 0$