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2) f(x) = ∫ f'(x) dx = ∫(5x -3) dx = 5/2 x² - 3x + c
f(2)= 18
5/2(2²) - 3(2) + c = 18
10 - 6 + c = 18
c= 14
f(x)= 5/2 x² - 3x + 14