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वे दो क्रमागत प्राकृत संख्याएँ ज्ञात कीजिए जिनके वर्गों का योग 545 है।

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माना दो अभीष्ट क्रमागत प्राकृत संख्याएँ x तथा x + 1 हैं।

प्रश्नानुसार, 

संख्याओं के वर्गो का योगफल = 545

अर्थात् x2 + (x + 1)2 = 545

x2 + (x2 + 2x + 1) = 54

2x2 + 2x + 1 – 545 = 0

2x2 + 2x – 544 = 0

x2 + x – 272 = 0

x2 + 17x – 16x – 272 = 0

x(x + 17) – 16(x + 17) = 0

(x + 17)(x – 16) = 0

यदि x + 17 = 0 तब x = – 17

तथा यदि x – 16 = 0 तब x = 16

परन्तु x = – 17 अमान्य है क्योंकि x एक प्राकृतिक संख्या है।

इसलिए, x = 16 ⇒ x + 1 = 17

अतः अभीष्ट क्रमागत प्राकृतिक संख्याएँ = 16 तथा 17

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