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Find all zeroes of the polynomial 2x^4-9...

Find all zeroes of the polynomial `2x^4-9x^3+5x^2+3x-1` if two of its zeroes are `2+sqrt(3)` and `2-sqrt(3)`

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The correct Answer is:
`:.` zeros of p(x) are `1, ( - 1)/( 2) , ( 2+ sqrt( 3)) ` and ` (2 - sqrt( 3))`
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