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L = integral bats atas di tulis 8 batas bawah ditulis 3 (20x² +9x+96)dx
L=20/3 x³ + 9/2 x² +96 x ]⁸₃ (batas atas 8, batas atas 3)
L=(20/3 . 8³ + 9/2 . 8² +96.8) - (20/3 . 3³ + 9/2 . 3² +96 . 2)
L=(20/3 .512 + 9/2 . 64 + 768) - (20/3 . 27 + 9/2 . 9 + 192)
L= (10240/3 +288+768) - ( 180 + 81/2 +192)
L=(10240/3+1056) - (81/2 + 372 )
L=10240/3 - 81/2 +1056 - 372
L=20237/6 + 684
L=3372,83 + 684
L=4056,83 satuan luas
#cobak di hitung lagi, kurang lebih caranya seperti itu