Notice that satisfies all the three equations. So is a root for each of them. Consequently, is a factor of each of them. Dividing each by we have:
For the second equation, further gives a solution; so divide it again by . Thus your job reduces to solve
For the first and third equation, and the reduced form of the second equation, try to factorize. This gives for the first equation and reduced second equation
respectively; so the solutions are and respectively.
For the third one, put values of and see where changes sign. Once you find two such consecutive values, you get one root between those x-values. Prceed accordingly.