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

(4+b)2=+b+b2

(a+7)2=a2+a+

(7a+b)2=*2+**b+b2

(a+4b)2=a2+*a*+*2

(18+z)*(18+z)=+z+z2

(x+6)*(6+x)=x2+x+

(7ax+bz)*(7ax+bz)=*()2+**bz+(bz)2

(vt+6up)*(6up+vt)=(vt)2+*vt*+*()2

(6+z)*(6+z)=+z+z2

(x+18)*(18+x)=x2+x+

(6x+bz2)*(6x+bz2)=*()2+**bz2+(bz2)2

(t+18dp)*(18dp+t)=t2+*t*+*()2


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