Answer
-1,2
Work Step by Step
Factoring the equation, we find:
$$ 4\left(x^2-x-2\right) \\ 4\left(x+1\right)\left(x-2\right) \\ x=-1,2$$
You can help us out by revising, improving and updating this answer.
Update this answerAfter 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.