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

(4-b)2=±±b±b2

(a-2)2=±a2±a±

(4a-b)2=±*2±**b±b2

(a-2b)2=±a2±*a*+*2

(4-t)2=±±8t±t2

(4-t)*(4-t)=±±8t±t2

(t-4)*(4-t)=±t2±8t±

(15-z)*(15-z)=±±z±z2

(x-9)*(9-x)=±x2±x±

(15ax-bz)*(15ax-bz)=±*()2±**bz±(bz)2

(vt-9up)*(9up-vt)=±(vt)2±*vt*±*()2

(9-z)*(9-z)=±±z±z2

(4-x)*(x-4)=±x2±x±

(9x-bz2)*(9x-bz2)=±*()2±**bz2±(bz2)2

(15dp-t)*(t-15dp)=±t2±*t*±*()2


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