a,5xy+z-5x-yz=(5xy-5x)-(yz-z)=5x(y-1)-z(y-1)=(y-1)(5x-z) b, y2(a-b)+b-a=y2(a-b)-a(a-b)=(y2-1)(a-b)=(y-1)(y+1)(a-b)
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a,5xy+z-5x-yz=(5xy-5x)-(yz-z)=5x(y-1)-z(y-1)=(y-1)(5x-z) b, y2(a-b)+b-a=y2(a-b)-a(a-b)=(y2-1)(a-b)=(y-1)(y+1)(a-b)