Bantu jawabdan jelaskan soal nomor 21 ya

Bab Differensial
Matematika SMA Kelas XII

f(x) = 1/3 . x^3 - 4x² + 15x + 6
f'(x) = x² - 8x + 15 = 0
x = 3 atau x = 5

f(3) = 1/3 . 3^3 - 4 . 3² + 15 . 3 + 6
f(3) = 9 - 36 + 45 + 6 = 24

f(5) = 1/3 . 5^3 - 4 . 5² + 15 . 5 + 6
f(5) = 125/3 - 100 + 75 + 6
f(5) = (125 - 300 + 225 + 18)/3 = 22,67

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