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Question 1403b
Complex Numbers
Solving Equations Using Sum/Product of Roots
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Given that
−
1
+
2
i
{- 1 + 2 \mathrm{i}}
−
1
+
2
i
is a root of the equation
(
−
3
−
i
)
z
2
+
(
−
3
+
9
i
)
z
+
10
=
0
,
(- 3 - \mathrm{i})z^2 + (- 3 + 9 \mathrm{i})z + 10=0,
(
−
3
−
i
)
z
2
+
(
−
3
+
9
i
)
z
+
10
=
0
,
find the second root of the equation.
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