Answer
10x$^2$-5xy-3y$^2$
Work Step by Step
10x$^2$-8xy-3(y$^2$-xy)
10x$^2$-8xy-3(y$^2$)-3(-xy)
10x$^2$-8xy-3y$^2$+3xy
10x$^2$+(-8xy+3xy)-3y$^2$
10x$^2$-5xy-3y$^2$
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