Work Step by Step
Factor out the greatest common factor, which is $4x^2$, to obtain: $20^4-8x^2=4x^2(5x^2-2)$
You can help us out by revising, improving and updating this answer.Update this answer
After you claim an answer you’ll have 24 hours to send in a draft. An editor will review the submission and either publish your submission or provide feedback.