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ix² + x + 2i = 0

delta

d² = 1 - 4*i*2i = 9

d = 3

x1 = (-1 + 3)/2i = 1/i = -i

x2 = (-1 - 3)/2i = -2/i = 2i

2x² + 2*(1 + i)x + 1 + i = 0

delta

d² = 4*(1 + i)² - 4*2*(1 + i)

d² = 8i - 8 - 8i = -8

d = √8i = 2√2i

x1 = (-2 - 2i + 2√2i)/4 = (-1 - i + √2i)/2

x2 = (-2 - 2i - 2√2i)/4 = (-1 - i - √2i)/2

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