(a-b)2=a2-2ab+b2

(7-b)2=±±b±b2

(a-6)2=±a2±a±

(7a-b)2=±*2±**b±b2

(a-6b)2=±a2±*a*+*2

(7-t)2=±±14t±t2

(7-t)*(7-t)=±±14t±t2

(t-7)*(7-t)=±t2±14t±

(19-z)*(19-z)=±±z±z2

(x-6)*(6-x)=±x2±x±

(19ax-bz)*(19ax-bz)=±*()2±**bz±(bz)2

(vt-6up)*(6up-vt)=±(vt)2±*vt*±*()2

(6-z)*(6-z)=±±z±z2

(7-x)*(x-7)=±x2±x±

(6x-bz2)*(6x-bz2)=±*()2±**bz2±(bz2)2

(19dp-t)*(t-19dp)=±t2±*t*±*()2


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