[tex]\displaystyle 1)64a^3+b^3=4^3a^3+b^3=(4a)^3+b^3=(4a+b)((4a)^2-4ab+b^2)=\\(4a+b)(16a^2-4ab+b^2)\\\\2)a^2-b^2-10a+25=(a-5)^2-b^2=(a-5-b)(a-5+b)[/tex]
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[tex]\displaystyle 1)64a^3+b^3=4^3a^3+b^3=(4a)^3+b^3=(4a+b)((4a)^2-4ab+b^2)=\\(4a+b)(16a^2-4ab+b^2)\\\\2)a^2-b^2-10a+25=(a-5)^2-b^2=(a-5-b)(a-5+b)[/tex]