Х^2-4х+4=3х-8
х^2-4х+4-3х+8=0
х^2-7х+12=0
д=49-4×12=1
х1=(7-1)/2=3
х2=(7+1)/2=4
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х^2-2х+1=29-5х
х^2-2х+1+5х-29=0
х^2+3х-28=0
д=9-4×(-28)=121
х1=(-3-11)/2=-7
х2=(-3+11)/2=4
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х^2-4=7х-4
х^2-4-7х+4=0
х^2-7х=0
х(х-7)=0
х1=0
х-7=0
x2=7