factorise this 5y5-405y
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5y5-405y
= 5(y4-81)
=5(y2+9)(y2-9)
=5(y2+9)(y+3)(y-3)
= 5(y4-81)
=5(y2+9)(y2-9)
=5(y2+9)(y+3)(y-3)
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