4x^2-1=12xX(X-7=8(7-X)

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4x^2-1=12xX(X-7=8(7-X)4x^2-1=12xX(X-7=8(7-X)4x^2-1=12xX(X-7=8(7-X)4x²-12x=1x²-3x=1/4x²

4x^2-1=12xX(X-7=8(7-X)
4x^2-1=12x
X(X-7=8(7-X)

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

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