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2b^{2}+7b+16
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2b^{2}+7b+16
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b^{2}+8b+16+b^{2}+b-2b
Use binomial theorem \left(p+q\right)^{2}=p^{2}+2pq+q^{2} to expand \left(b+4\right)^{2}.
2b^{2}+8b+16+b-2b
Combine b^{2} and b^{2} to get 2b^{2}.
2b^{2}+9b+16-2b
Combine 8b and b to get 9b.
2b^{2}+7b+16
Combine 9b and -2b to get 7b.
b^{2}+8b+16+b^{2}+b-2b
Use binomial theorem \left(p+q\right)^{2}=p^{2}+2pq+q^{2} to expand \left(b+4\right)^{2}.
2b^{2}+8b+16+b-2b
Combine b^{2} and b^{2} to get 2b^{2}.
2b^{2}+9b+16-2b
Combine 8b and b to get 9b.
2b^{2}+7b+16
Combine 9b and -2b to get 7b.
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