(a-b)2=a2-2ab+b2
(8-b)2=±
±
b
±
b2
(a-8)2=±
a2±
a
±
(8a-b)2=±
*
2
±
*
*b
±
b2
(a-8b)2=±
a2±
*a*
+
*
2
(8-t)2=±
±
16t±
t2
(8-t)*(8-t)=±
±
16t±
t2
(t-8)*(8-t)=±
t2±
16t±
(9-z)*(9-z)=±
±
z
±
z2
(x-1)*(1-x)=±
x2±
x
±
(9ax-bz)*(9ax-bz)=±
*(
)2
±
*
*bz
±
(bz)2
(vt-1up)*(1up-vt)=±
(vt)2±
*vt*
±
*(
)2
(1-z)*(1-z)=±
±
z
±
z2
(8-x)*(x-8)=±
x2±
x
±
(1x-bz2)*(1x-bz2)=±
*(
)2
±
*
*bz2
±
(bz2)2
(9dp-t)*(t-9dp)=±
t2±
*t*
±
*(
)2