Evaluate
\left(y-1\right)\left(y+17\right)
Expand
y^{2}+16y-17
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y^{2}+16y+64-81
Use binomial theorem \left(a+b\right)^{2}=a^{2}+2ab+b^{2} to expand \left(y+8\right)^{2}.
y^{2}+16y-17
Subtract 81 from 64 to get -17.
y^{2}+16y+64-81
Use binomial theorem \left(a+b\right)^{2}=a^{2}+2ab+b^{2} to expand \left(y+8\right)^{2}.
y^{2}+16y-17
Subtract 81 from 64 to get -17.
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