First of all, I tried to search online but I didn't find any explanation. The following equations, I just don't know how I could solve'em, the question asks for the solutions.
I don't think I ever saw equations like this on high school, should I apply baskara? It looks like a quartic equation but all the quartic equations I searched for contains a constant after the "$x$". Can you help me, please?
Please pardon me for the noob (I think) question, I'm sure it will look simple after you explain it but I really couldn't find a way to solve it yet.