plz solve this
only underline ones
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Step-by-step explanation:
no.1
1-2xy-(x²+y²)=1-(2xy+x²+y²)
=1-(x+y)²
no.2
a²+6a+8=a²+4a+2a+8
=a(a+4)+2(a+4)
=(a+2)(a+4)
no.3
6x²-13x+6=6x²-9x-4x+6
=3x(2x-3)-2(2x-3)
=(3x-2)(2x-3)
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