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

(5-b)2=±±b±b2

(a-5)2=±a2±a±

(5a-b)2=±*2±**b±b2

(a-5b)2=±a2±*a*+*2

(5-t)2=±±10t±t2

(5-t)*(5-t)=±±10t±t2

(t-5)*(5-t)=±t2±10t±

(18-z)*(18-z)=±±z±z2

(x-1)*(1-x)=±x2±x±

(18ax-bz)*(18ax-bz)=±*()2±**bz±(bz)2

(vt-1up)*(1up-vt)=±(vt)2±*vt*±*()2

(1-z)*(1-z)=±±z±z2

(5-x)*(x-5)=±x2±x±

(1x-bz2)*(1x-bz2)=±*()2±**bz2±(bz2)2

(18dp-t)*(t-18dp)=±t2±*t*±*()2


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