y³-y²-5y+125=
(y³+125)-(y²+5y)=
(y³+5³) - y(y+5)=
(y+5)(y²-5y+25)-y(y+5)=
(y+5)(y²-6y+25)
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Verified answer
y³-y²-5y+125=
(y³+125)-(y²+5y)=
(y³+5³) - y(y+5)=
(y+5)(y²-5y+25)-y(y+5)=
(y+5)(y²-6y+25)