\(a^4-ax^3-ay+xy\)
\(=a\left(a^3-x^3\right)-y\left(a-x\right)\)
\(=a\left(a-x\right)\left(a^2+ax+x^2\right)-y\left(a-x\right)\)
\(=\left(a-x\right)\left[a\left(a^2+ax+x^2\right)-y\right]\)
\(=\left(a-x\right)\left(a^3+a^2\cdot x+ax^2-y\right)\)
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