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b= -2
c= 2
x1,2 = -b +- akar b2 - 4ac / 2a
= 2 +- akar -2pankat2 - 4.1.2 / 2.1
= 2 +- akar 4 - 8 / 2
= 2 +- akar -4 / 2
x1 = 2 + akar -4 / 2
x2 = 2 - akar -4 / 2
maaf kalau salah dan kurang jelas