4x²-12x=1x²-3x=1/4x²-3x+9/4=1/4+9/4(x-3/2)²=10/4x-3/2=±√10/2x=(3-√10)/2,x=(3+√10)/2移项x(x-7)-8(7-x)=0x(x-7)+8(x-7)=0(x-7)(x+8)=0x=7,x=-8
4x^2-1=12xX(X-7=8(7-X)
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