Evaluate
\left(b-7\right)\left(b+7\right)^{2}+343
Expand
b^{3}+7b^{2}-49b
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b^{3}+7b^{2}-49b-343+343
Use the distributive property to multiply b^{2}-49 by b+7.
b^{3}+7b^{2}-49b
Add -343 and 343 to get 0.
b^{3}+7b^{2}-49b-343+343
Use the distributive property to multiply b^{2}-49 by b+7.
b^{3}+7b^{2}-49b
Add -343 and 343 to get 0.
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