a2-b2=(a-b)(a+b)

(1-x)*(1+x)=-2

(a-1)*(a+1)=2-

(1-cd)*(1+cd)=-()2

(5b-1)*(5b+1)=*2-

(5b-1)*(5b+1)=(*)2-

(14-m)*(14+m)=-2

(z-14)*(z+14)=2-

(14-cd)*(cd+14)=-()2

(1b-14)*(1b+14)=*2-

(1b-14)*(14+1b)=(*)2-

(5ab-zx)*(zx+5ab)=*()2-()2

(5z+a)*(a-5z)=2-*2

(mlu+5k)*(5k-mlu)=*2-()2

(14bc3-5x)*(5x+14bc3)=*b2c6-*2

(14bc3-5x)*(5x+14bc3)=(*bc3)2-*2


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