Explanation:
x² = 36/121
move terms to left side
x² - 36/121 = 0
1/121 (121x² - 36) = 0
121x² - 36 = 0
Use quadratic formula
x= -b + √b² - 4ac / 2a
a = 121
b= 0
c= 36
x = -0 + √0² - 4.121 (-36) / 2.121
x = + 132/ 242
sperate the equation
x = 131/242
x = -131/242
x = 6/11
x= -6/11