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

Promoted
Evegotanswers
Lv 4
Evegotanswers asked in Science & MathematicsMathematics · 6 years ago

Math Help : 2^-5x+1=1/8?

3 Answers

Relevance
  • Anonymous
    6 years ago
    Favorite Answer

    Poor presentation !!

    2^(- 5x + 1) = 1/8

    both 2 and (1/8) are base-2 numbers...

    2^(- 5x + 1) = 2^(- 3)

    if the bases are equal, the exponents must be equal !

    (- 5x + 1) = - 3

    - 5x = - 4

    x = 4/5

    check...do something !

  • az_lender
    Lv 7
    6 years ago

    Do you mean 2^(-5x+1) = 1/8 ?

    If so, -5x + 1 = -3, and x = 4/5.

  • Andrea Ameden
    6 years ago

    use logarithms to find this

Still have questions? Get your answers by asking now.