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Byju's Answer
Standard VII
Mathematics
Unit Digit of Numbers in Exponential Form
State True or...
Question
State True or False.
Evaluate:
x
5
+
n
×
(
x
2
)
3
n
+
1
x
7
n
−
2
, then answer is
x
9
.
A
True
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B
False
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Solution
The correct option is
A
True
⇒
x
5
+
n
×
(
x
2
)
3
n
+
1
x
7
n
−
2
⇒
x
(
5
+
n
)
+
(
6
n
+
2
)
x
7
n
−
2
⇒
x
7
+
7
n
x
7
n
−
2
⇒
x
(
7
+
7
n
)
−
(
7
n
−
2
)
⇒
x
7
+
7
n
−
7
n
+
2
⇒
x
9
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0
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Q.
State True or False.
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a
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a
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a
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Standard VII Mathematics
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