Question 323602
{{{x^4 - 5x^2 - 36 = (x^2+4)(x^2-9)=0}}}
{{{x^4 - 5x^2 - 36 = (x^2+4)(x-3)(x+3)=0}}}
Four solutions:
{{{x=3}}}
{{{x=-3}}}
{{{x=0 +- 2i}}}