Tìm x:

Tìm x:
a/ 4.(x - 3)^2 - (2x - 1).(2x + 1) = 10
b/ (x - 4)^2 - (x - 2).(x + 2) = 6
c/ 9.(x - 1)^2 - (3x -2).(3x + 2) = 10