(u+8v)2−(8u+v)2=u2+2*8v*u+64v2-64u2-8u*2*v-v2= u2+16uv+64v2-64u2-16uv-v2=(u2-v2)+(64v2-64u2)=(u-v)*(u+v)+(8v-8u)*(8v+8u)
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(u+8v)2−(8u+v)2=u2+2*8v*u+64v2-64u2-8u*2*v-v2= u2+16uv+64v2-64u2-16uv-v2=(u2-v2)+(64v2-64u2)=(u-v)*(u+v)+(8v-8u)*(8v+8u)