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16-9b^{2}
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16-9b^{2}
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b^{2}+8b+16-2b\left(5b+4\right)
Use binomial theorem \left(p+q\right)^{2}=p^{2}+2pq+q^{2} to expand \left(b+4\right)^{2}.
b^{2}+8b+16-10b^{2}-8b
Use the distributive property to multiply -2b by 5b+4.
-9b^{2}+8b+16-8b
Combine b^{2} and -10b^{2} to get -9b^{2}.
-9b^{2}+16
Combine 8b and -8b to get 0.
b^{2}+8b+16-2b\left(5b+4\right)
Use binomial theorem \left(p+q\right)^{2}=p^{2}+2pq+q^{2} to expand \left(b+4\right)^{2}.
b^{2}+8b+16-10b^{2}-8b
Use the distributive property to multiply -2b by 5b+4.
-9b^{2}+8b+16-8b
Combine b^{2} and -10b^{2} to get -9b^{2}.
-9b^{2}+16
Combine 8b and -8b to get 0.
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