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Solve 8x^4 -2x^3 - 27 x^2 +6x +9=0 giv...

Solve` 8x^4 -2x^3 - 27 x^2 +6x +9=0` given that two roots have the same absolute value , but are opposite in sign.

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The correct Answer is:
`+- sqrt(3) ,3/4 ,-1/2`
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