Find all xxx such that log2(x2−4)=3\log_2(x^2 - 4) = 3log2(x2−4)=3.
x=±4x = \pm 4x=±4
x=4x = 4x=4 only
x=±23x = \pm 2\sqrt{3}x=±23
x=±22x = \pm 2\sqrt{2}x=±22