(х-1)(х-2)=(3х+1)(х-2)<=>x^2-3x+2=3x^2-5x-2 <=> 2x^2-2x-4=0 <=>x^2-x-2=0
D=1+8=9
x=1+3/2
x=1-3/2
x=2
x=-1
ответ:-1;2
(х-1)(2х+3)=7 <=> 2x^2+x-3=7 <=> 2x^2+x-10=0
D=1+80=81
x=-1+9/4
x=-1-9/4
x=-2.5
ответ:-2,5;2
(х-1)(х-2)=(3х+1)(х-2)
x²-2x-x+2=3x²-6x+x-2
2x²-2x-4=0
x²-x-2=0
x²+x-2x-2=0
x(x+1)-2(x+1)=0
(x-2)(x+1)=0
x=2 ∨ x=-1
(х-1)(2х+3)=7
2x²+3x-2x-3=7
2x²+x-10=0
Δ=1²-4*2*(-10)
Δ=1+80
Δ=81
√Δ=9
x₁=(-1-9)/(2*2)
x₁=-10/4
x₁=-5/2
x₂=(-1+9)/(2*2)
x₂=8/4
x₂=2
(х-1)(х-2)=(3х+1)(х-2)<=>x^2-3x+2=3x^2-5x-2 <=> 2x^2-2x-4=0 <=>x^2-x-2=0
D=1+8=9
x=1+3/2
x=1-3/2
x=2
x=-1
ответ:-1;2
(х-1)(2х+3)=7 <=> 2x^2+x-3=7 <=> 2x^2+x-10=0
D=1+80=81
x=-1+9/4
x=-1-9/4
x=2
x=-2.5
ответ:-2,5;2
(х-1)(х-2)=(3х+1)(х-2)
x²-2x-x+2=3x²-6x+x-2
2x²-2x-4=0
x²-x-2=0
x²+x-2x-2=0
x(x+1)-2(x+1)=0
(x-2)(x+1)=0
x=2 ∨ x=-1
(х-1)(2х+3)=7
2x²+3x-2x-3=7
2x²+x-10=0
Δ=1²-4*2*(-10)
Δ=1+80
Δ=81
√Δ=9
x₁=(-1-9)/(2*2)
x₁=-10/4
x₁=-5/2
x₂=(-1+9)/(2*2)
x₂=8/4
x₂=2