SOLUTION: please help me solve this equation 3x^4-11x^2-20=0

Question 575503: please help me solve this equation
3x^4-11x^2-20=0
Answer by Earlsdon(6294) (Show Source): You can put this solution on YOUR website!
Sometimes it simpifies things a bit by temporarily using a substitute variable:
Temporarily let so now you have:
Factor:
Solve for y:
or so...
or Replace to get...
or Taking the square roots, we get...
or or or
If you need your answers in approximate form, then...
or or or
Here's what the graph looks like:

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