3(1/4 - x²) = 0
3x² - 75 = 0
7(x² - 1/9) = 0
(1/16)x² - 1/9 = 0
5x² - 45 = 0
x = - 1/2 y x = 1/2
x = - 4/3 y x = 4/3
x = -3 y x = 3
x = -5 y x = 5
x = - 1/3 y x = 1/3