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दो क्रमागत विषम धनात्मक पूर्णांकों के वर्गों का योग 394 है। पूर्णांक ज्ञात कीजिए।

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Best answer

माना, पहला विषम धन पूर्णांक = x

तथा दूसरा विषम धन पूर्णांक = x + 2

प्रश्नानुसार, 

(x)2 + (x + 2)2 = 394

x2 + x2 + 4 + 4x – 394 = 0

2x2 + 4x – 390 = 0

2(x2 + 2x – 195) = 0

x2 + 2x – 195 = 0

x2 + 15x – 13x – 195 = 0

x(x + 15) – 13(x + 15) = 0

(x + 15)(x – 13) = 0

जब x + 15 = 0, तब x = – 15 (अमान्य)

तथा जब x – 13 = 0, तब x = 13

अतः पहली विषम संख्या = x = 13

तथा दूसरी विषम संख्या = x + 2 = 13 + 2 = 15

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