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Uji turunan kedua
y" = 12x² - 4
x = -1 → y" = 12.(-1)² - 4 = 8 > 0, minimum
x = 0 → y" = 12.0² - 4 = -4 < 0, maksimum lokal
x = 1 → y" = 12.1² - 4 = 8 > 0, minimum
Nilai minimum
f(-1) = (-1)^4 - 2.(-1)² = 1 - 2 = -1
f(1) = 1^4 - 2.1² = 1 - 2 = -1
Nilai maksimum
f(0) = 0^4 - 2.0² = 0
Jadi nilai minimum = -1 dan nilai maksimum lokal = 0,