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Gunakan rumus ABC
x₁₂ = ( -b (+-) √D ) / 2a dengan D = b² - 4ac
a = 1, b=4, c=-2
D = 4²-4(1)(-2) = 16+8 = 34
x₁₂ = ( -4 (+-) √34 ) / 2(1) = -2 (+-) (1/2√34)
Jadi akar-akar penyelesaiannya adalah
x = -2 + (1/2√34) dan x = -2 - (1/2√34)