a.x(x-3)-x^2+2=0 b.x^2-2x+1=0
x^2-3x-x^2+2=0 (x-1)^2=0
-3x+2=0 x-1=0
-3x=-2 x=1
x=2/3
c.x(x-1)-(x+3)-(x+4)=5x d.CÂU NÀY MK KO GIẢI ĐC ,CÓ SAI ĐỀ KO BẠN
x^2-x-x-3-x-4=5x
x^2-3x-7=5x
x^2-7=8x
x^2-8x-7=0
x^2-x-7x-7=0
x(x-1)-7(x-1)=0
(x-7)(x-1)=0
TH1:x-7=0
x=7
TH2:x-1=0
x=1