a^2-y^2+6y-9. गुरांखंड
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a^2-(y^2-6y+9)
=a^2-(y^2-3y-3y+9)
=a^2-(y-3)^2
=(a+y-3)(a-y+3)
=a^2-(y^2-3y-3y+9)
=a^2-(y-3)^2
=(a+y-3)(a-y+3)
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