Question 628443
steps to solve x^4 + 2x^2-15=0
factor
(x^2+5)(x^2-3)=0
x^2+5=0
x^2=-5
x=±√-5
x=±(√5) i
or
x^2-3=0
x^2=3
x=±√3
two real roots: ±√3
two imaginary or non-real roots: ±(√5) i