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f'(x)=x-3
syarat naik
f'(x) > 0
x-3 > 0
x > 3
syarat turun
f'(x) < 0
x-3 < 0
x < 3
Nilai stasioner diperoleh jika f'(x)=0
x-3=0
x=3
f(3)=1/2 (3)² - 3(3) + 4
=9/2 - 9 + 4
=9/2 - 18/2 + 8/2
=-1/2
Titik stasionernya {3,-1/2}
b) f(x)=x² - 8x + 16
f'(x)=2x-8
syarat naik
f'(x) > 0
2x-8 > 0
2x>8
x > 4
syarat turun
f'(x) < 0
2x-8 < 0
2x<8
x < 4
Nilai stasioner diperoleh jika f'(x)=0
2x-8=0
x=4
f(4)=(4-4)²
=0
Titik stasionernya {4,0}
c) f(x)=4x-12x³
f'(x)=4-36x²
syarat naik
f'(x) > 0
4-36x² > 0
36x² > 4
x²>4/36
x>2/6
syarat turun
f'(x) < 0
4-36x² < 0
36x² < 4
x²<4/36
x<2/6
Nilai stasioner diperoleh jika f'(x)=0
x-3=0
x=3
f(2/6)=4(2/6) - 12 (2/6)³
=8/6 - 12 (8/216)
=8/6 - 96/216
=288/216 - 96/216
=192/216
=48/54
=8/9
Titik stasionernya {2/6,8/9}
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