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प्रश्न
Find the two natural numbers which differ by 5 and the sum of whose squares is 97.
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उत्तर
Let the two numbers be x and x + 5.
From the given information,
x2 + (x + 5)2 = 97
2x2 + 10x + 25 – 97 = 0
2x2 + 10x – 72 = 0
x2 + 5x – 36 = 0
(x + 9)(x – 4) = 0
x = –9 or 4
Since, –9 is not a natural number.
So, x = 4.
Thus, the numbers are 4 and 9.
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