\(\left(x-1\right)\left(y-4\right)+\left(4-y\right)^2\)
\(=-\left(x-1\right)\left(4-y\right)+\left(4-y\right)^2\)
\(=\left(4-y\right)\left[-x+1+4-y\right]\)
\(=\left(4-y\right)\left(-x+5-y\right)\)
\(=\left(y-4\right)\left(x+y-5\right)\)
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