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A particle is acted upon by a force given by $F=-\alpha x^{3}-\beta x^{4}$ where $\alpha$ and $\beta$ are positive constants. At the point $\mathrm{x}=0$, the particle is $-$
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In neutral equilibrium
$\frac{-\mathrm{d} \mathrm{U}}{\mathrm{dx}}=\mathrm{F},\left(\frac{\mathrm{d} \mathrm{U}}{\mathrm{dx}}\right)_{\mathrm{x}=0}=0 \text { and }\left(\frac{\mathrm{d}^{2} \mathrm{U}}{\mathrm{dx}^{2}}\right)_{\mathrm{x}=0}=0$
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