When a certain spring is stretched, the restoring force satisfies the equation F=-kx+βx^3. If k=10.2N/m and β?

When a certain spring is stretched, the restoring force satisfies the equation F=-kx+βx^3. If k=10.2N/m and β=97N/m^3, calculate the work done by this force when the spring is stretched 0.086m
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