SOLUTION: Factor and solve x^4-2x^2-15=0

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Question 700607: Factor and solve
x^4-2x^2-15=0
Answer by checkley79(3341) About Me  (Show Source):
You can put this solution on YOUR website!
x^4-2x^2-15=0
(x^2-5)(x^2+3)=0
x^2-5=0
x^2=5
x=sqrt5=(+-2.235) ans.
x^2+3=0
x^2=-3
x=sqrt-3
x=(+-1.732i) ans.