Verified answer

Ответ:

1. [tex]-(x+1)^{2}[/tex]

2. [tex](1-a-b)(1+a+b)[/tex]

Объяснение:

1. [tex]-x^{2} -2x-1 = -x^{2} -x-x-1 = -x(x+1)-(x+1) = -(x+1)(x+1) = -(x+1)^{2}[/tex]

2. [tex]1-a^{2} -2ab-b^{2} =1-(a^{2} +2ab+b^{2}) = 1-(a+b)^{2} =(1-(a+b))(1+(a+b)) = (1-a-b)(1+a+b)[/tex]

Ответ:

1)-x*x-2x-1=-x*-x-1²=x²-1

2)1-a*a-ab-ab-b*b