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प्रश्न
Simplify:
(b2 – 49)(b + 7) + 343
उत्तर
We have,
(b2 – 49)(b + 7) + 343 = b2(b + 7) – 49(b + 7) + 343
= b3 + 7b2 – 49b – 343 + 343
= b3 – 49b + 7b2
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