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Standard XI
Mathematics
NCERT
Question
Express the given complex number in the form
a
+
i
b
:
(
5
i
)
(
−
3
5
i
)
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Solution
Verified by Toppr
(
5
i
)
(
−
3
5
i
)
=
(
5
×
−
3
5
)
×
(
i
×
i
)
=
−
3
i
2
=
−
3
(
−
1
)
=
3
,
[
∵
i
2
=
−
1
]
Which is clearly of the form
a
+
i
b
where,
a
=
3
and
b
=
0
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