замена x^2+4x+1=t
(t-5)*t=6
t^2-5t-6=0
t1=6 x^2+4x+1=6 x^2+4x-5=0 x1=-5 x2=1
t2=-1 x^2+4x+1=-1 x^2+4x+2=0 D=12 x3=(-4-2V3)/2=-2-V3 x4=-2+V3
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замена x^2+4x+1=t
(t-5)*t=6
t^2-5t-6=0
t1=6 x^2+4x+1=6 x^2+4x-5=0 x1=-5 x2=1
t2=-1 x^2+4x+1=-1 x^2+4x+2=0 D=12 x3=(-4-2V3)/2=-2-V3 x4=-2+V3