Describe the long run behavior of f(r)=5r4+4r32r2+1\displaystyle {f{{\left({r}\right)}}}=-{5}{r}^{{4}}+{4}{r}^{{3}}-{2}{r}^{{2}}+{1}

As r\displaystyle {r}\to-\infty, f(r)\displaystyle {f{{\left({r}\right)}}}\to

As r\displaystyle {r}\to\infty, f(r)\displaystyle {f{{\left({r}\right)}}}\to