a(a-c+1) = a*a-ac+a =a^2-ac+a
5x(x+y^2-5)=5x^2+5xy^2-25x
-xy(3y^2-5)=-3xy^3+5xy
-2^2xy(4x-3y+5xy)=-36x^2y+12xy^2
a(a-c+1) = a*a-ac+a =a^2-ac+a
5x(x+y^2-5)=5x^2+5xy^2-25x
-xy(3y^2-5)=-3xy^3+5xy
-2^2xy(4x-3y+5xy)=-36x^2y+12xy^2