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64-9b^{2}
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64-9b^{2}
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b^{2}+16b+64-2b\left(5b+8\right)
Use binomial theorem \left(p+q\right)^{2}=p^{2}+2pq+q^{2} to expand \left(b+8\right)^{2}.
b^{2}+16b+64-10b^{2}-16b
Use the distributive property to multiply -2b by 5b+8.
-9b^{2}+16b+64-16b
Combine b^{2} and -10b^{2} to get -9b^{2}.
-9b^{2}+64
Combine 16b and -16b to get 0.
b^{2}+16b+64-2b\left(5b+8\right)
Use binomial theorem \left(p+q\right)^{2}=p^{2}+2pq+q^{2} to expand \left(b+8\right)^{2}.
b^{2}+16b+64-10b^{2}-16b
Use the distributive property to multiply -2b by 5b+8.
-9b^{2}+16b+64-16b
Combine b^{2} and -10b^{2} to get -9b^{2}.
-9b^{2}+64
Combine 16b and -16b to get 0.
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