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Solve the equation x^5 -x^4 + 8x^2 -...

Solve the equation `x^5 -x^4 + 8x^2 - 9x + 15=0` two of its roots being ` - sqrt(3) ,1-2 sqrt(-1)`

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