Question
Simplify:$ (b^2- 49)(b + 7) + 343$
✓
Answer
$ \left(b^2-49\right)(b+7)+343 $
$ =b^2(b+7)-49(b+7)+343 $
$ =b^3+7 b^2-49 b-343+343 $
$ =b^3-49 b+7 b^2 $
$ =b^2(b+7)-49(b+7)+343 $
$ =b^3+7 b^2-49 b-343+343 $
$ =b^3-49 b+7 b^2 $
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