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

(4-b)2=±±b±b2

(a-8)2=±a2±a±

(4a-b)2=±*2±**b±b2

(a-8b)2=±a2±*a*+*2

(4-t)2=±±8t±t2

(4-t)*(4-t)=±±8t±t2

(t-4)*(4-t)=±t2±8t±

(19-z)*(19-z)=±±z±z2

(x-4)*(4-x)=±x2±x±

(19ax-bz)*(19ax-bz)=±*()2±**bz±(bz)2

(vt-4up)*(4up-vt)=±(vt)2±*vt*±*()2

(4-z)*(4-z)=±±z±z2

(4-x)*(x-4)=±x2±x±

(4x-bz2)*(4x-bz2)=±*()2±**bz2±(bz2)2

(19dp-t)*(t-19dp)=±t2±*t*±*()2


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