7a(7m-3u) +11m(3u-7m)=7a(7m-3u)-11(7m-3u)=(7m-3u)(7a-11)
1)x=2-y
2)(2-y)y=-8
2y-y²+8=0
-y²+2y+8=0
y²-2y-8=0
y1+y2=2
y1•y2= -8
y1=4 y2= -2
3) x1=2-4=-2
x2=2+2=4
(в*2+а*2)/ав : (а*2+в2) :3ав=3
Выведем полный квадрат
x^2 - 6x + 5 = (x^2 - 6x + 9) - 4 = (x - 3)^2 - 2^2 =
= (x - 3 - 2)(x - 3 + 2) =
= (x - 5 )(x - 1)