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

(9-b)2=±±b±b2

(a-1)2=±a2±a±

(9a-b)2=±*2±**b±b2

(a-1b)2=±a2±*a*+*2

(9-t)2=±±18t±t2

(9-t)*(9-t)=±±18t±t2

(t-9)*(9-t)=±t2±18t±

(4-z)*(4-z)=±±z±z2

(x-9)*(9-x)=±x2±x±

(4ax-bz)*(4ax-bz)=±*()2±**bz±(bz)2

(vt-9up)*(9up-vt)=±(vt)2±*vt*±*()2

(9-z)*(9-z)=±±z±z2

(9-x)*(x-9)=±x2±x±

(9x-bz2)*(9x-bz2)=±*()2±**bz2±(bz2)2

(4dp-t)*(t-4dp)=±t2±*t*±*()2


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