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  • 22x-5(2x)=-4, solve for x.
Multiple choice

22x-5(2x)=-4, solve for x.

  1. 2

  2. 0

  3. 2 and 0

  4. -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).

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