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y = x + 1
absis titik pot kedua nya
x² -x - 2 - x - 1 = 0
x² -2x -3 = 0
(x+1)(x-3) = 0
x = - 1 atau x = 3
(grafik di lampiran)
L = L1 + L2
L= ₋₁³∫(x+1)-(x²-x-2) dx + ₃⁴∫ (x²-x-2)-(x+1) dx
L = ₋₁³∫-x² +2x + 3 dx + ₃⁴∫x² -2x - 3 dx
L = -¹/₃ x³ + x² + 3x|³₋₁ + (¹/₃ x³ -x² - 3x]⁴₃
L = -¹/₃(28) +(8)+ 3(4) + ¹/₃(37)- (7) - 3(1)
L = -28/3 + 37/3 + 20- 10 = 9/3 +10 = 13