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α=2β
α·β=c/a
2β · β=2
2β²=2
β= +-1
α+β= -b/a
2β+β= -(a-1)
3β= -a+1
substitusikan nilai β=1
3= -a+1
a= -4 (bukan a yg dimaksud)
β= -1
-3= -a+1
a=4 (memenuhi syarat a>0)