Solve for xxx: 2x2−4x≤182^{x^2 - 4x} \leq \frac{1}{8}2x2−4x≤81.
[1,3][1, 3][1,3]
[0,4][0, 4][0,4]
[−1,5][-1, 5][−1,5]
[2,4][2, 4][2,4]