SOLUTION: please help me solve this problem. {{{x^4+2x^2-15=0}}}

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Question 265825: please help me solve this problem.
x%5E4%2B2x%5E2-15=0
Answer by stanbon(75887) About Me  (Show Source):
You can put this solution on YOUR website!
x^4+2x^2-15=0
Factor:
(x^2+5)(x^2-3) = 0
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x^2 = -5 or x^2 = 3
x = +-isqrt(5) or x = +-sqrt(3)
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Cheers,
Stan H.