Results 1 to 2 of 2

Math Help - Solving equations using calculator - Exponential/Logarithmic eq

  1. #1
    sara555
    Guest

    Solving equations using calculator - Exponential/Logarithmic eq

    a) (0.75)10^1.25x = 11.25

    b) 3.2e^-0.5 = 0.04e^3j

    c) 164.9 =log square root 2 pie R

    d) log 20 + log(6x-20) = 3

    e) log(x-3) = 1/2 log(12-8x)

    can someone please help me with these promlems asap. Thanks
    Follow Math Help Forum on Facebook and Google+

  2. #2
    GAMMA Mathematics
    colby2152's Avatar
    Joined
    Nov 2007
    From
    Alexandria, VA
    Posts
    1,172
    Awards
    1
    Quote Originally Posted by sara555 View Post
    a) (0.75)10^1.25x = 11.25

    can someone please help me with these promlems asap. Thanks
    (0.75)10^{1.25x} = 11.25

    Divide both sides by 0.75

    10^{1.25x} = \frac{11.25}{0.75} \Rightarrow 15

    Take the natural log of both sides

    \ln|10|1.25x = \ln|15|

    2.303*1.25x = 2.708

    x = 0.940855566
    Follow Math Help Forum on Facebook and Google+

Similar Math Help Forum Discussions

  1. Exponential and logarithmic equations
    Posted in the Algebra Forum
    Replies: 7
    Last Post: May 3rd 2011, 08:28 AM
  2. Exponential and Logarithmic Equations
    Posted in the Pre-Calculus Forum
    Replies: 1
    Last Post: April 1st 2010, 09:11 PM
  3. Exponential and Logarithmic Equations
    Posted in the Pre-Calculus Forum
    Replies: 3
    Last Post: December 14th 2009, 06:41 AM
  4. Exponential and Logarithmic Equations
    Posted in the Algebra Forum
    Replies: 6
    Last Post: November 23rd 2008, 03:11 PM
  5. Exponential and Logarithmic Equations
    Posted in the Pre-Calculus Forum
    Replies: 3
    Last Post: June 15th 2006, 01:08 PM

Search Tags


/mathhelpforum @mathhelpforum