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a=3, b=2, c=-18
x1,x2= [-b ± √(b²-4ac) ]/2a
= [-2 ± √(4+216)] /6
= [-2 ± √220] /6
= [-2 ± 2√55] /6
x1 = -(1/3) + (1/3)√55 = 2,14
x2= -(1/3) - (1/3)√55 = -2,8
tinggal masuk2in, hitung sendiri ya