Find the zeros of f(x)=x4−13x2+36f(x) = x^4 - 13x^2 + 36f(x)=x4−13x2+36.
{2,3}\{2, 3\}{2,3}
{2,−2,3,−3}\{2, -2, 3, -3\}{2,−2,3,−3}
{9,4}\{9, 4\}{9,4}
{1,2,3,4}\{1, 2, 3, 4\}{1,2,3,4}