1. The problem statement, all variables and given/known data 2. Relevant equations x(2x^2 - 5) = -1 3. The attempt at a solution This question has been flung at me without any pre-examples how to solve it. I have only dealt with equations like 2x^2 + 5x - 12 = 0. I know that the equation above should be set to zero, but how do I deal with the x coefficient on the paranthesis? I don't know how to solve this -- it's very confusing and if someone can help me I would be grateful!