what is the value of n if 7^2n+4*7^4=?
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Answer:
∵
a
n
a
m
=a
m−n
so,
7
2
7
2n+1
=7
2n+1−2
=7
2n−1
now,
⟹7
2n−1
=7
3
As bases are equal
powers are equal
2n−1=3
n=2
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