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x1+x2= -b/a = -4/2 = -2
x1.x2= c/a= 1/2
karena yg diminta positif maka
x1+x2= 2
x1.x2= 1/2
sehingga,
x² - (x1+x2) x + (x1.x2) = 0
x² - 2x + 1/2 = 0 (dikali 2)
2x² - 4x + 1 = 0 (A)