Evaluate
\left(8-b\right)\left(3b+8\right)
Expand
64+16b-3b^{2}
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b^{2}+16b+64-4b^{2}
Use binomial theorem \left(p+q\right)^{2}=p^{2}+2pq+q^{2} to expand \left(b+8\right)^{2}.
-3b^{2}+16b+64
Combine b^{2} and -4b^{2} to get -3b^{2}.
b^{2}+16b+64-4b^{2}
Use binomial theorem \left(p+q\right)^{2}=p^{2}+2pq+q^{2} to expand \left(b+8\right)^{2}.
-3b^{2}+16b+64
Combine b^{2} and -4b^{2} to get -3b^{2}.
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