a(a-c+1) =a×a-ac+a=a²-ac+a
5x(x+y²-5)=5x×x+5xy²-5x×5=5x²+5xy²-25x
-xy(3y²+2x)= -xy×3y²-xy×2x=-3xy3-2x²y
2²xy(4x-3y+5xy)=16x²y-12xy²+20x²y²
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a(a-c+1) =a×a-ac+a=a²-ac+a
5x(x+y²-5)=5x×x+5xy²-5x×5=5x²+5xy²-25x
-xy(3y²+2x)= -xy×3y²-xy×2x=-3xy3-2x²y
2²xy(4x-3y+5xy)=16x²y-12xy²+20x²y²