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du = 3 dx
8 du = 24 dx
so, integral di atas dapat menjadi :
= int 8(u+5)/3 (u)^6 du
= 8/3 int (u^7 + 5u^6) du
= 8/3 (1/8 u^8 + 5/7 u^7) + C
= 1/3 u^8 + 40/21 u^7 + C
= 1/3 (3x-5)^8 + 40/21 (3x-5)^7 + C