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x² + 3x = 2x + 2
x² - x -2 = 0
(x+2) (x-1) = 0
x = -2 v x = 1
maka batasnya -2 dan 1
[tex] \int\limits {- x^{2} -x+2} \, dx = \frac{27}{6} = 4,5
b. 4,5