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Question
Mathematics
If z1=2+3i and z2=1+2i. Then (z1/z2) is equal to
Q. If
z
1
=
2
+
3
i
and
z
2
=
1
+
2
i
. Then
z
2
z
1
is equal to
4400
271
Complex Numbers and Quadratic Equations
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A
5
8
−
5
1
i
38%
B
5
8
+
5
1
i
34%
C
−
5
8
−
5
1
i
17%
D
−
5
8
+
5
1
i
12%
Solution:
z
2
z
1
=
(
2
+
3
i
)
(
1
+
2
i
1
)
=
(
2
+
3
i
)
(
5
1
−
5
2
i
)
=
(
5
2
+
5
6
)
+
i
(
−
5
4
+
5
3
)
=
5
8
−
5
1
i