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यदि (x – 1) बहुपद x4 – 3x3 + bx2 + 8x – 4 का एक गुणनखण्ड है, तो b का मान ज्ञात कीजिए।

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यदि (x – 1), x4 – 3x3 + bx2 + 8x – 4 का एक गुणनखण्ड है तो x – 1 = 0 या x = 1 रखने पर

शेषफल = 0

(1)4 – 3(1)3 + b(1)2 + 8(1) – 4 = 0

1 – 3 + b + 8 – 4 = 0

b + 2 = 0

b = 0 – 2 ⇒ b = -2

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