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x1 x2 = (q - 1) / 2
x1² + x2² = 4
(x1 + x2)² - 4x1 x2 = 4
q² / 4 - 2(q - 1) = 4
q² / 4 - 2q + 2 = 4
q² / 4 - 2q - 2 = 0
q² - 8q - 8 = 0
q1,2 = (8 + √ (64 - 128)) / 4
= ( 8 + √(-64) )/4
= (8 + 8√-1) /4
= (2 + 2√-1)