[tex](a-5b)(a-3b)=a^2-8ab+15b^2\\[/tex]
[tex]x^2y+y^2x-8xy-7=xy(x+y-8)-7=-7[/tex]
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[tex](a-5b)(a-3b)=a^2-8ab+15b^2\\[/tex]
[tex]x^2y+y^2x-8xy-7=xy(x+y-8)-7=-7[/tex]