Tìm x: x^2 - 64 = 8x - 16

Tìm x:
a)x^2 - 64 = 8x - 16
b) (x - 4)^2 - 36 = 0
c) x^2 - 4x + 3 = 0
d) (2x - 1)^2 - (2x+5)(2x-5) = 18