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Army Group X Practice Set 4
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© examsnet.com
Question : 51
Total: 70
What are the roots of equation
x
2
−
7
i
x
−
12
=
0
?
3
i
,
4
i
−
3
i
,
4
i
3
i
,
−
4
i
−
3
i
,
−
4
i
Validate
Solution:
The given equation is
x
2
−
7
i
x
−
12
=
0
⇒
x
2
−
3
i
x
−
4
i
x
+
12
i
2
=
0
[
∵
i
2
=
−
1
]
⇒
x
(
x
−
3
i
)
−
4
i
(
x
−
3
i
)
=
0
⇒
(
x
−
3
i
)
(
x
−
4
i
)
=
0
∴
x
=
3
i
,
4
i
© examsnet.com
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