Matematika

Pertanyaan

f'(x)= 4(x-5) (x+1) dan f(1)=10

1 Jawaban

  • f'(x) = 4(x - 5)(x + 1)
    f'(x) = 4(x² - 4x - 5)
    f'(x) = 4x² - 16x - 20

    f(x) = ∫f'(x) dx
    f(x) = ∫(4x² - 16x - 20) dx
    f(x) = 4/3 x³ - 8x² - 20x + C
    f(1) = 10
    4/3 . 1³ - 8 . 1² - 20 . 1 + C = 10
    4/3 - 8 - 20 + C = 10
    C - 26 2/3 = 10
    C = 10 + 26 2/3
    C = 36 2/3

    Jadi..
    f(x) = 4/3 x³ - 8x² - 20x + 36 2/3

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