(p+8)^2=p^2+16p+64
(10x-3y)^2=100x^2-60y+9y^2
(x-9)+(x+9)=x-9+x+9=2x
(4m+7n)(7n-4m)=28mn-16m^2+49n^2-28mn=49n^2-16m^2
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(p+8)^2=p^2+16p+64
(10x-3y)^2=100x^2-60y+9y^2
(x-9)+(x+9)=x-9+x+9=2x
(4m+7n)(7n-4m)=28mn-16m^2+49n^2-28mn=49n^2-16m^2