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Nomor 31Nomor 32
f(x) = x³ - 3x² - 9x + 6
f'(x) = 3x² - 6x - 9
Nomor 33
f(x) = (2x + 5)(3x - 3)
f(x) = 6x² - 6x + 15x - 15
f(x) = 6x² + 9x - 15
f'(x) = 12x + 9
f'(2) = 12(2) + 9 = 33
Nomor 34
f(x) = x² - 8x + 16
f'(x) = 2x - 8
Untuk menentukan nilai dan titik stasioner, f'(x) = 0
2x - 8 = 0
2x = 8
x = 4
f(4) = 4² - 8(4) + 16
= 16 - 32 + 16
= 0
Nilai stasioner adalah 0
Titik stasioner adalah (4,0)
Nomor 35
f(x) = (2x + 1)/(x + 3)
Bentuk f(x) = u / v
Turunannya adalah f'(x) = (u'.v - u.v')/v²
f'(x) = (2(x + 3) - 1.(2x + 1))/(x + 3)²
= (2x + 6 - 2x - 1) / (x + 3)²
= 5 / (x + 3)²
Nomor 36
f(x) = (3x² + 2)(x + 1)
= 3x³ + 3x² + 2x + 2
f'(x) = 9x² + 6x + 2
Nomor 37
f(x) = x² - 8x - 9
f'(x) = 2x - 8
Agar fungsi naik, f'(x) > 0
2x - 8 > 0
2x > 8
x > 4
Intervalnya adalah x > 4