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

(9+b)2=+b+b2

(a+4)2=a2+a+

(4a+b)2=*2+**b+b2

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

(9+z)*(9+z)=+z+z2

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

(4ax+bz)*(4ax+bz)=*()2+**bz+(bz)2

(vt+7up)*(7up+vt)=(vt)2+*vt*+*()2

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

(x+9)*(9+x)=x2+x+

(7x+bz2)*(7x+bz2)=*()2+**bz2+(bz2)2

(t+9dp)*(9dp+t)=t2+*t*+*()2


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