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दो पूर्णाक a तथा b ऐसे ज्ञात कीजिए किः

(a + b) = 1 और ab = -20

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x2 + (a + b) x + ab में (a + b) = 1 और ab = -20 रखने पर,

अत: पूर्णांक 5 , -4 है।

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