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1/4 . 2² + 2b + a = 0
1 + 2b + a = 0
2b + a = -1
1/4 x² + bx + a= 0 memiliki 1 faktor
berarti d = 0
d = b² - 4ac
b²-4.1/4 a = 0
b² - a = 0