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

(6-b)2=±±b±b2

(a-2)2=±a2±a±

(6a-b)2=±*2±**b±b2

(a-2b)2=±a2±*a*+*2

(6-t)2=±±12t±t2

(6-t)*(6-t)=±±12t±t2

(t-6)*(6-t)=±t2±12t±

(7-z)*(7-z)=±±z±z2

(x-3)*(3-x)=±x2±x±

(7ax-bz)*(7ax-bz)=±*()2±**bz±(bz)2

(vt-3up)*(3up-vt)=±(vt)2±*vt*±*()2

(3-z)*(3-z)=±±z±z2

(6-x)*(x-6)=±x2±x±

(3x-bz2)*(3x-bz2)=±*()2±**bz2±(bz2)2

(7dp-t)*(t-7dp)=±t2±*t*±*()2


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