3. When a certain rubber band is stretched a distance x, it exerts a restoring force F = ax + bx², where a and b are constants. The work done in stretching this rubber band from x = 0 to x = L is:
(A) aL2/2 + bL³/3
(B) aL+bL2/2
(C) a + 2bL
(D) aL + 2bL²
(E) aL² + bLx³.
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