if n is an odd positive integer then an + bn is divisible by
a) a²+b²
b) a+b
c) a-b
d) none of these
Answers
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Given : n is odd positive integer
aⁿ + bⁿ
To find : aⁿ + bⁿ is divisible by
a) a²+b²
b) a+b
c) a-b
d) none of these
Solution:
aⁿ + bⁿ
n is odd positive integer
then aⁿ + bⁿ is divisible by a + b
Let say aⁿ + bⁿ is a polynomial
and divisible by a - k
=> a = k
kⁿ + bⁿ = 0
kⁿ = -bⁿ
=> k = - b as n is odd positive integer
aⁿ + bⁿ is divisible by a -(-b) = a + b
so a+ b is the the correct option
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