Ответ на фото//////////////
(b-a) (-a-b) +2b² = (-a-b)(b-a) +2b²=
=- (b+a)(b-a) +2b²= -(b²-a²) +2b²=
= a²-b²+2b²=a²+b²
5х-2(х-3)=6х
5х-2х+6=6х
3х-6х=-6
-3х=-6
х=2
6х -(2х+5)=2(3х-6)
6х-2х-5=6х-12
-2х=-7
х=3,5
х(х+5)=(х+3)
х^2+5х=х^2+6х+9
-х=9
х=-9
(m+4)^2-(m-3)(m+3) = m^2+8m+16-(m^2-9)=m^2+8m+16-m^2+9=8m+25
<span>(x+1)^2+(x-1)^2=x^2+2x+1+x^2-2x+1=2x^2+2=2(x^2+1)</span>