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D = b² - 4ac
= (-7)² - 4(1)(12)
= 49 - 48
= 1
y = 2x²+4x+2
x = b/-2a = 4/-4 = -1
y = 2(-1)² + 4(-1) + 2
= 2 - 4 + 2
= 0
Jadi titik balik minimumnya adalah (-1 , 0)