SOLUTION: Fine the real or imaginary solutions of each equation by factoring {{{X^4-8x^2=-16}}} Can you also explain how to get this? I don't understand this lesson.

Question 708364: Fine the real or imaginary solutions of each equation by factoring

Can you also explain how to get this? I don't understand this lesson.
Answer by ankor@dixie-net.com(22740) (Show Source): You can put this solution on YOUR website!

Add 16 to both sides
x^4 - 8x^2 + 16 = 0
Can be factored to
(x^2 - 4)(x^2 - 4) = 0
then we have
x^2 = 4
x = +/-
two solutions
x = +2
x = -2
:
Graphically

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