Completely factor the left side of the equation into two or more factors , 121x^4 - 36x^2 = 0 .

First, factor out the x² term:     x²(121x² - 36)  =  0

Now, factor the remaining term as the difference of two squares:

                                              x²(11x - 6)(11x + 6)  =  0

Set each of the factors equal to 0:          x² = 0         11x - 6  =  0          11x + 6  =  0

Finally, solve each of these reduced equations.