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x^2 = -x+2
x^2 + x -2 = 0
(x -1)(x+2) = 0
x = 1 atau x = -2
integral dari -2 sampai 1 (-x+2-x^2)
= -1/2 x^2 +2x - 1/3x^3 (masukkan 1 dan -2)
= (-1/2 + 2 -1/3) - (-2-4+8/3)
= 7/6 - (-10/3)
= 7/6 + 20/6
= 27/6
= 4,5