Answer:
see below
Step-by-step explanation:
x⁵ - 8x⁴ + 22x³ - 26x² + 21x - 18 = 0
x = 2, x = ± i, x=3 with multiplicity 2
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x⁴ - 5x³ + 7x² - 5x + 6 = 0
x = 2, x=3, x = ± i
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-1 + 4i = 4 + i
i
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x³ - 26x² + 21x - 18 = 0
x = ± 2i, x = 3/2
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(1 + i) (-3 - 4i)
= 1 - 7i
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6.
(-5 + 2i) + (3 - 6i)
= -2 -4i
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7.
x⁴ + 5x² + 4 = 0
x = ± i , x = ± 2i
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8.
(7 - i) - (-5 + 6i)
= 12 - 7i
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9.
(4 - i) (4 + i)
= 17
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10.
(3 + 8i) (4 - 3i)
= 36 + 23i
