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

(5-b)2=±±b±b2

(a-2)2=±a2±a±

(5a-b)2=±*2±**b±b2

(a-2b)2=±a2±*a*+*2

(5-t)2=±±10t±t2

(5-t)*(5-t)=±±10t±t2

(t-5)*(5-t)=±t2±10t±

(6-z)*(6-z)=±±z±z2

(x-7)*(7-x)=±x2±x±

(6ax-bz)*(6ax-bz)=±*()2±**bz±(bz)2

(vt-7up)*(7up-vt)=±(vt)2±*vt*±*()2

(7-z)*(7-z)=±±z±z2

(5-x)*(x-5)=±x2±x±

(7x-bz2)*(7x-bz2)=±*()2±**bz2±(bz2)2

(6dp-t)*(t-6dp)=±t2±*t*±*()2


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