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yaitu dgn meng integralkan f'(x)
-> f (x) = 1/4 x^2 + 2x + c
substitusikan f (2)
-> f (2) = 5 + c
karena f (2) = 8
so,
8 = 5 + c
dgn demikian c = 3
substitusikan 3 ke persamaan f (x)
f (x) = 1/4 x^2 + 2x + c
f (x) = 1/4 x^2 + 2x + 3
semoga membantu