Q. 84 J

# Simplify

(b^{2}-49)(b + 7) + 343

Answer :

The given expression is

(b^{2}-49)(b + 7) + 343

= b^{2}.b + 7b^{2}-49b-49.7 + 343

= b^{3} + 7b^{2}-49b-343 + 343

= b^{3} + 7b^{2}-49b

Therefore, (b^{2}-49)(b + 7) + 343 = b^{3} + 7b^{2}-49b

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