Q.
Number of positive integers n for which n2+96 is a perfect square is
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a
8
b
12
c
4
d
infinite
answer is C.
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Detailed Solution
Let m be a positive integer for which n2+96=m2⇒ m2−n2=96⇒(m+n)(m−n)=96⇒ (m+n){(m+n)−2n}=96⇒ m+n and m−n must be both even 96=2×48 or 4×24 or 6×16 or 8×12Number of solution = 4
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