(a-b)2=a2-2ab+b2
(9-b)2=±
±
b
±
b2
(a-6)2=±
a2±
a
±
(9a-b)2=±
*
2
±
*
*b
±
b2
(a-6b)2=±
a2±
*a*
+
*
2
(9-t)2=±
±
18t±
t2
(9-t)*(9-t)=±
±
18t±
t2
(t-9)*(9-t)=±
t2±
18t±
(1-z)*(1-z)=±
±
z
±
z2
(x-1)*(1-x)=±
x2±
x
±
(1ax-bz)*(1ax-bz)=±
*(
)2
±
*
*bz
±
(bz)2
(vt-1up)*(1up-vt)=±
(vt)2±
*vt*
±
*(
)2
(1-z)*(1-z)=±
±
z
±
z2
(9-x)*(x-9)=±
x2±
x
±
(1x-bz2)*(1x-bz2)=±
*(
)2
±
*
*bz2
±
(bz2)2
(1dp-t)*(t-1dp)=±
t2±
*t*
±
*(
)2