Question 259859
Hint: Let {{{z=x^2}}} and notice that {{{z^2=x^4}}}. Apply the appropriate substitutions to get {{{10z^2-27z+5=0}}}. Solve this equation using the quadratic formula to get two solutions in terms of 'z'. Use each solution to find two solutions (per solution of 'z') in terms of 'x'. In total, you should get 4 solutions in terms of 'x'.