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Standard VI
Maths
Question
The output of
z
3
+
2
z
2
+
5
z
+
1
, where
z
=
1
, is
7
9
2
None of the above
A
2
B
9
C
7
D
None of the above
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Solution
Verified by Toppr
Given equation is
z
3
+
2
z
2
+
5
z
+
1
Put
z
=
1
, we get
z
3
+
2
z
2
+
5
z
+
1
=
1
3
+
2
×
1
2
+
5
×
1
+
1
=
1
+
2
+
5
+
1
=
9
Hence, option C is correct.
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