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Question

Find two consecutive positive integers, sum of whose squares is 365.

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Solution

Let the first number is x, then the next number will be x+1.
Then,
x2+(x+1)2=365 {Given}
x2+x2+2x+1=365
2x2+2x364=0
x2+x182=0
x2+14x13x182=0
x(x+14)13(x+14)=0
(x13)(x+14)=0
x=13,14
Considering positive number, the numbers are 13 and 14.

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