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D= b²-4ac
D = 3² - 4(1)(17)
D = 9 - 68
D = - 59
krn D < 0 , definit negatif , akar akarnya tidak real (imajiner)
(x + ³/₂)² = -17 + 9/4 = - 59/4
x + ³/₂ = +- ¹/₂ √(59 i) dengan (-1) = √i
x = - ³/₂+₋¹/₂√(59 i)
x = ⁻ ³/₂ + ¹/₂ √(59 i) atau x = - ³/₂ - ¹/₂ √(59i)
x₁ = - ¹/₂ ( 3 - √(59i)) atau x₂ = - ¹/₂ (3 + √(59i)