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b = -2
c = 4
x1 = -(-2) + akar (-2)^2 - 4.3.4
x1 = 2 + akar 4-48
x1 = 2 + akar - 44
x1 = 2 + (-11)
x1 = -9
x2 = -(-2) - akar (-2)^2 - 4.3.4
x2 = 2 - akar 4-48
x2 = 2 - akar - 44
x2 = 2 - (-11)
x2 = -13
maka:
x1 = -9
x2 = -13