\[\boxed{\text{810\ (810).\ }\text{Еуроки\ -\ ДЗ\ без\ мороки}}\]
\[y = x^{2} - 8x\ \ \ и\ \ \ \ y = 4 - 8x\]
\[x^{2} - 8x = 4 - 8x\]
\[x^{2} = 4\]
\[x^{2} - 4 = 0\]
\[(x - 2)(x + 2) = 0\]
\[x = 2\ \ \ \ \ \ или\ \ \ \ \ x = - 2\]
\[Ответ:\ x = \pm 2.\]
\[\boxed{\text{810.\ }\text{Еуроки\ -\ ДЗ\ без\ мороки}}\]
\[1)\ a^{12} + b^{9} =\]
\[= \left( a^{4} + b^{3} \right)\left( a^{8} - a^{4}b^{3} + b^{6} \right)\]
\[2)\ x^{18} - y^{27} =\]
\[= \left( x^{6} - y^{9} \right)\left( x^{12} + x^{6}y^{9} + y^{18} \right)\]
\[3)\ m^{6}n^{3} - p^{12} =\]
\[= \left( m^{2}n - p^{4} \right)\left( m^{4}n^{2} + m^{2}np^{4} + p^{8} \right)\]
\[4)\ a^{24}b^{33} + 1 =\]
\[= \left( a^{8}b^{11} + 1 \right)\left( a^{16}b^{22} - a^{8}b^{11} + 1 \right)\]
\[5)\ 8m^{6} + 27n^{9} =\]
\[= \left( 2m^{2} + 3n^{3} \right)\left( 4m^{4} + 6m^{2}n^{3} + 9n^{6} \right)\]
\[6)\ 0,027x^{21} + 0,125y^{24} =\]
\[= (0,3x^{7} + 0,5y^{8})(0,09x^{14} + 0,15x^{7}y^{8} + 0,25y^{16})\]
\[7)\ 0,216 - 8c^{27} =\]
\[= \left( 0,6 - 2c^{9} \right)\left( 0,36 - 1,2c^{9} + 4c^{18} \right)\]
\[8)\ 1000a^{12}b^{3} - 0,001c^{6}d^{15} =\]
\[= (10a^{4}b - 0,1c^{2}d^{5})(100a^{8}b^{2} + a^{4}bc^{2}d^{5} + 0,01c^{4}d^{10})\]