(a²-2ab)(a²-5ab+3b2)

[latex](a^2-2ab)(a^2-5ab+3b^2)=a^4-5a^3b+3a^2b^2-2a^3b+10a^2b^2-6ab^3= \\= a^4-7a^3b+13a^2b^2-6ab^3 [/latex]