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KEAM 2020 Math Paper
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© examsnet.com
Question : 11
Total: 120
If
2
+
i
is a root of
x
2
−
4
x
+
c
=
0
, where
c
is a real number, then the value of
c
is
2
3
4
5
0
Validate
Solution:
α
=
2
+
i
β
=
2
−
i
α
β
=
5
=
c
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