Question

plz solve this
only underline ones​

Answer 1

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)