[tex]1)3xy+24y-9x-72=(3xy+24y)-(9x+72)=\\\\=3y(x+8)-9(x+8)=(x+8)(3y-9)\\\\\\2)15a^2-5a^2x+15ax-5ax^2=(15a^2-5a^2x)+(15ax-5ax^2)=\\\\=5a^2(3-x)+5ax(3-x)=(5a^2+5ax)(3-x)=5a(a+x)(3-x)[/tex]
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[tex]1)3xy+24y-9x-72=(3xy+24y)-(9x+72)=\\\\=3y(x+8)-9(x+8)=(x+8)(3y-9)\\\\\\2)15a^2-5a^2x+15ax-5ax^2=(15a^2-5a^2x)+(15ax-5ax^2)=\\\\=5a^2(3-x)+5ax(3-x)=(5a^2+5ax)(3-x)=5a(a+x)(3-x)[/tex]