factorise y^2-6y+5.....
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y^2 - 6y + 5
= y^2 - (5 + 1) y + 5
= y^2 - 5y - y + 5
= y ( y - 5) - 1 ( y - 5)
= ( y - 5 ) ( y - 1 ). (Ans)
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