factorize y^2-8y+7
please let
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y²-8y+7=y²-(7+1)y+7
=y²-7y-y+7
=y(y-7)-1(y-7)
=(y-1)(y-7)
=y²-7y-y+7
=y(y-7)-1(y-7)
=(y-1)(y-7)
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