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misal : u = 3x - 2 ⇒ 3x = 2 + u ⇒ x = (1/3)(2 + u)
du/dx = 3
dx = 1/3 .du
soal menjadi :
∫ 4x (3x - 2)³ dx = ∫4 (1/3) (u + 2) u³ 1/3 du
= 4/9 ∫ 2u³ + u^4 du
= 4/9 {(2/4)u^4 + (1/5)u^5 + c
= 4/9 {(1/2)u^4 + (1/5).u^5 + c
= (4/9) .(1/10).u^4 (5 + 2 u) + c
= (2/45) (5 + 2u) .u^4 + c
= (2/45) {5 + 2(3x - 2)) .(3x - 2)^4 + c
= (2/45) (5 + 6x - 4) (3x - 2)^4 + c
= (2/45) (1 + 6x) (3x - 2)^4 + c
jawaban : A