f'(x) = 3x² - 6x - 5
f(x) = 3/3 x^3 - 6x/2 - 5x + C
f(x) = x^3 - 3x² - 5x + C
f(4) = 4^3 - 3 . 4² - 5 . 4 + C = 90
64 - 48 - 20 + C = 90
-4 + C = 90
C = 90 + 4
C = 94
f(x) = x^3 - 3x² - 5x + 94
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f'(x) = 3x² - 6x - 5
f(x) = 3/3 x^3 - 6x/2 - 5x + C
f(x) = x^3 - 3x² - 5x + C
f(4) = 4^3 - 3 . 4² - 5 . 4 + C = 90
64 - 48 - 20 + C = 90
-4 + C = 90
C = 90 + 4
C = 94
f(x) = x^3 - 3x² - 5x + 94