all the coefficients of the quartic are real so the complex conjugate is a root.

so we have two factors and .

so is a factor of your quartic, divide your quartic by this factor and then solve the quadratic to get the two remaining roots.

you want the solve the equation . first rewrite -32 in the form ofFind all 5th roots of -32 and all 4th rots of 81i

tell me how it goes

Bobak