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If 2x^3 +ax^2+ bx+ 4=0 (a and b are posi...

If `2x^3 +ax^2+ bx+ 4=0` (a and b are positive real numbers) has 3 real roots, then prove that `a+ b ge 6 (2^(1/3)+ 4^(1/3))`

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The correct Answer is:
`rArr b ge 6xx4^(1//3)`
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