(x-1)(x+1)=x²-1
(1/2x+5)(1/2x-5)=(1/2x)²-5²=1/4x²-25
(3x-4)(4+3x)=(3x-4)(3x+4)=9x²-16
(6-1/3x)(1/3x+6)=(-1/3x+6)(1/3x+6)=-1/9x²+36
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(x-1)(x+1)=x²-1
(1/2x+5)(1/2x-5)=(1/2x)²-5²=1/4x²-25
(3x-4)(4+3x)=(3x-4)(3x+4)=9x²-16
(6-1/3x)(1/3x+6)=(-1/3x+6)(1/3x+6)=-1/9x²+36