2x+138 + C
2x+148 + C
2x+144 + C
2x+126 + C
Correct answer is B
Recall chain rule:
u = 2x +1; du = 2dx → dx = du2
u3 = ∫ u3 du2 → 12 ∫ u3
= 1∗u42∗4
= u48 → 2x+148 + C
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