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x²-3x²+3x≤2(x²+x-x-1)-4x
-2x²+3x≤2x²-2-4x
-4x²+7x+2≤0
Δ=49-4(-4*2)
Δ=49+32
Δ=81
√Δ=9
x1=(-7-9)/-8
x1=16/8=2
x2=(-7+9)/-8
x2=-2/8= -1/4
x²-3x²+3x ≤ (2x-2)(x+1)-4x
x²-3x²+3x ≤ 2x²+2x-2x-2-4x
x²-3x²+3x-2x²-2x+2x+4x ≤ -2
7x ≤ -2 /:7
x ≤ -2/7
(/)->ułamek