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3x^2-12=0
3x^2=12
x=plus min2
di atas 2 bawah min 2 positif
Pada interval dia naik, maka:
g'(x) > 0
3x² - 12 > 0
3(x + 4)(x - 4) > 0
x < -4 atau x > 4
Pada interval dia turun, maka:
g'(x) < 0
3x² - 12 < 0
3(x + 4)(x - 4) < 0
-4 < x < 4