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यदि त्रिघात बहुपद x3 + ax2 + bx + c का एक मूल -1 है तब अन्य दो मूलों का गुणनफल ज्ञात कीजिए।

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त्रिघात बहुपद x3 + ax2 + bx + c में,

α = -1, β = ?, γ = ?

तब मूलों का गुणनफल (α · β · γ) = \(\frac{-d}{a}\)

⇒ α · β · γ = \(\frac{-c}{1}\)

∵ α = -1 तो -1 × β, γ = -c ⇒ βγ = c

अतः दो मूलों का गुणनफल, βγ = c

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