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f(x) = ∫ 2x-5 dx
f(x) = x² - 5x + c
f(4) = 7 ⇒ 4² -5(4) + c= 7
c = 7+4 = 11
f(x)= x² - 5x + 11
memotong sumbu y jika x= 0
f(0) = 11
titik potong (x,y) = (0,11)