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

(9+b)2=+b+b2

(a+2)2=a2+a+

(2a+b)2=*2+**b+b2

(a+9b)2=a2+*a*+*2

(7+z)*(7+z)=+z+z2

(x+2)*(2+x)=x2+x+

(2ax+bz)*(2ax+bz)=*()2+**bz+(bz)2

(vt+2up)*(2up+vt)=(vt)2+*vt*+*()2

(2+z)*(2+z)=+z+z2

(x+7)*(7+x)=x2+x+

(2x+bz2)*(2x+bz2)=*()2+**bz2+(bz2)2

(t+7dp)*(7dp+t)=t2+*t*+*()2


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