Multiple choice 22x-5(2x)=-4, solve for x. 2 0 2 and 0 -2 and 0 Reveal answer Fill a bubble to check yourself C Correct answer Explanation Let u = 2^x. The equation becomes u^2 - 5u + 4 = 0, which factors to (u-4)(u-1) = 0. Solving for u gives 2^x = 4 (so x = 2) or 2^x = 1 (so x = 0).