Evaluate
\left(y-6\right)\left(y-2\right)
Expand
y^{2}-8y+12
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y^{2}-8y+16-4
Use binomial theorem \left(a-b\right)^{2}=a^{2}-2ab+b^{2} to expand \left(y-4\right)^{2}.
y^{2}-8y+12
Subtract 4 from 16 to get 12.
y^{2}-8y+16-4
Use binomial theorem \left(a-b\right)^{2}=a^{2}-2ab+b^{2} to expand \left(y-4\right)^{2}.
y^{2}-8y+12
Subtract 4 from 16 to get 12.
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