А) 2(х-2)+х(x-2)=0
2х-4+х²-2х=0
-4+х²=0
х²=4
х=2
х=-2
Б)5(y+3)-(y-1)(y+3)
(у+3)(5-(у-1))
(у+3)(5-у+1)
(у+3)(6-у)
В) t(t+3)+t²-9=0
t²+3t+t²-9=0
2t²+3t-9=0
Д=3²+4×2×(-9)=81
t₁=-3+9/4=1,5
t₂=-3-9/4=-3
А) 2(х-2)+х(x-2)=0
2х-4+х²-2х=0
-4+х²=0
х²=4
х=2
х=-2
Б)5(y+3)-(y-1)(y+3)
(у+3)(5-(у-1))
(у+3)(5-у+1)
(у+3)(6-у)
В) t(t+3)+t²-9=0
t²+3t+t²-9=0
2t²+3t-9=0
Д=3²+4×2×(-9)=81
t₁=-3+9/4=1,5
t₂=-3-9/4=-3