i suppose that " ° " means " · "
a/w you should appply distributive property
4xr+4x · 6xy-6r-6 · 6y
then apply the sign rule +(-a) = -a
4xr+4 · 6xy-6r-6 · 6y
finally you simplify
4xr+4 · 6xy-6r-6 · 6y
4xr+24xy-6r-6 · 6y
4xr+24xy-6r-36y
so the answer is 4xr+24xy-6r-36y
