Question 1019518
 {{{ x^4-5x^2-24 = (x^2-8)(x^2+3) = (x-sqrt(8))(x+sqrt(8))(x-sqrt(3)*i)(x+sqrt(3)*i)=(x-2sqrt(2))(x+2sqrt(2))(x-sqrt(3)*i)(x+sqrt(3)*i)}}}

Thus the solutions to {{{ x^4-5x^2-24=0}}} are {{{2sqrt(2)}}}, {{{-2sqrt(2)}}}, {{{sqrt(3)*i}}}, and {{{-sqrt(3)*i}}}.