Answer :

The given expression is

(b2-49)(b + 7) + 343


= b2.b + 7b2-49b-49.7 + 343


= b3 + 7b2-49b-343 + 343


= b3 + 7b2-49b


Therefore, (b2-49)(b + 7) + 343 = b3 + 7b2-49b


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