Yahoo Answers is shutting down on May 4th, 2021 (Eastern Time) and beginning April 20th, 2021 (Eastern Time) the Yahoo Answers website will be in read-only mode. There will be no changes to other Yahoo properties or services, or your Yahoo account. You can find more information about the Yahoo Answers shutdown and how to download your data on this help page.
Trending News
Solve indices equation?
2^x - 2^(x-1) = 4
Help me solve it please, take note of the spaces, i use spaces to prevent using too many brackets.
2 Answers
- Curt MonashLv 71 decade agoFavorite Answer
Let y = 2^(x-1). Then the equation is equivalent to 2y - y = 4. :) (Why?)
Proceed from there (and remember you're actually solving for x, not just y!).
- mcdivittLv 44 years ago
section = length * Width 2304 = (x+2) * x = x^2+2x x^2+2x-2304 = 0 x = [-2+/- sqrt(2^2+4*a million*2304)]/2 = -a million+sqrt(2305) or -a million-sqrt(2305) we are talking approximately lengths so x > 0 and to that end the answer is -a million+sqrt(2305) -- that's the size of the shortest section and is approximately 47cm
