Answer
$0,-2,2$
Work Step by Step
Given: $5x^4-20x^2=0$
or, $5x^2(x^2-4)=0$
Need to use factorization to solve the quadratic equation.
This can be factorized as follows:
$5x^2(x^2-2^2)=0$
or, $5x^2(x-2)(x+2)=0 $
Set each factor equal to zero, we get
$x=0,-2,2$
