Tìm x, biết: a) (x - 2)^2 - (x - 3)(x + 3) = 6; b) 4(x - 3)^2 - (2x - 1)(2x + 1) = 0

tìm x
a. (x-2)^2-(x-3)(x+3)=6
b. 4(x-3)^2-(2x-1)(2x+1)=10
c. (x-4)^2-(x-2)(x+2)=6
d. 9(x+1)^2-(3x-2)(3x+2)=10