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Int (2x - 1)(x² - x + 5)^3 dx
= Int (x² - x + 5)^3 d(x² - x + 5)
= (1/4)(x² - x + 5) + C
2.
2(√5 - 1) - 8/(√5 - 1)
= 2√5 - 2 - (8/(√5 - 1) × (√5 + 1)/(√5 + 1))
= 2√5 - 2 - 8(√5 + 1)/(5 - 1)
= 2√5 - 2 - 2(√5 + 1)
= -4
4.
f(x) = (2x - 1)^3
f'(x) = 3 × (2x - 1)^2 × 2 = 6(2x - 1)^2
f"(x) = 6 × 2(2x - 1) × 2 = 24(2x - 1)
f"(2) = 24(2.2 - 1) = 72