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₁[⁴ -x² + 4x + 5
-1/3 x³ + 2x² + 5x ]₁⁴
-1/3 (4³-1³) + 2(4² - 1²) + 5(4-1)
-1/3 (64-1) + 2(16-1) + 5(3)
-1/3 x 63 + 2(15) + 15
-21 + 30 + 15
24 satuan luas.