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（a+2)^2(a-2)-4(a-2)
=(a-2)[(a+2)²-4】
=a(a-2)(a+4)
x(a-3)+y(3-a)
=x(a-3)-y(a-3)
=(a-3)(x-y)
m^2(x-y)+n^2(y-x)
=m²(x-y)-n²(x-y)
=(x-y)(m²-n²)
=(x-y)(m+n)(m-n)
4(x-2y)^2-9(2x+y)^2
=(2x-4y+6x+3y)(2x-4y-6x-3y)
=(8x-y)(-4x-7y)
=-(8x-y)(4x+7y)
=(a-2)[(a+2)²-4】
=a(a-2)(a+4)
x(a-3)+y(3-a)
=x(a-3)-y(a-3)
=(a-3)(x-y)
m^2(x-y)+n^2(y-x)
=m²(x-y)-n²(x-y)
=(x-y)(m²-n²)
=(x-y)(m+n)(m-n)
4(x-2y)^2-9(2x+y)^2
=(2x-4y+6x+3y)(2x-4y-6x-3y)
=(8x-y)(-4x-7y)
=-(8x-y)(4x+7y)
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