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

(2-b)2=±±b±b2

(a-2)2=±a2±a±

(2a-b)2=±*2±**b±b2

(a-2b)2=±a2±*a*+*2

(2-t)2=±±4t±t2

(2-t)*(2-t)=±±4t±t2

(t-2)*(2-t)=±t2±4t±

(19-z)*(19-z)=±±z±z2

(x-5)*(5-x)=±x2±x±

(19ax-bz)*(19ax-bz)=±*()2±**bz±(bz)2

(vt-5up)*(5up-vt)=±(vt)2±*vt*±*()2

(5-z)*(5-z)=±±z±z2

(2-x)*(x-2)=±x2±x±

(5x-bz2)*(5x-bz2)=±*()2±**bz2±(bz2)2

(19dp-t)*(t-19dp)=±t2±*t*±*()2


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