Results 1 to 5 of 5

Math Help - :(---Rational Exponents---:(PLZ HELP

  1. #1
    Newbie
    Joined
    Sep 2005
    Posts
    4

    :(---Rational Exponents---:(PLZ HELP

    ^=exponent
    X=multiply
    x=variable

    4^(-2)
    4^(-3)-4^(0)


    Solve for x:
    3^(2x+1-x+2)=3^(x2-x)

    Anyone know how to solve these???
    Follow Math Help Forum on Facebook and Google+

  2. #2
    Site Founder MathGuru's Avatar
    Joined
    Mar 2005
    From
    San Diego
    Posts
    478
    Awards
    1

    Lightbulb

    Remember that x^(-1) = 1/x
    Also remember that x^0 = 1

    so 4^(-3) = 1/(4^3)

    And

    4^(-2)
    4^(-3)-4^(0)

    can be rewritten as

    1/16
    1/64-1

    can you take it from there?
    Follow Math Help Forum on Facebook and Google+

  3. #3
    Site Founder MathGuru's Avatar
    Joined
    Mar 2005
    From
    San Diego
    Posts
    478
    Awards
    1

    Lightbulb

    3^(2x+1-x+2)=3^(x2-x)

    take log_3 of both sides to render the equation

    2x+1-x+2 = x2-x, did you mean x^2 instead of x2 anyway you can take it from here I'm sure.
    Follow Math Help Forum on Facebook and Google+

  4. #4
    Site Founder MathGuru's Avatar
    Joined
    Mar 2005
    From
    San Diego
    Posts
    478
    Awards
    1

    Lightbulb Learn Latex, you will love it

    BTW we usually use * for multiply to avoid confusion with the variable x

    you can also learn latex and write stuff like this \frac{1}{3 \cdot x^{-2}}

    click on it to find out what I did.
    Follow Math Help Forum on Facebook and Google+

  5. #5
    Newbie
    Joined
    Sep 2005
    Posts
    4
    Thnx
    Follow Math Help Forum on Facebook and Google+

Similar Math Help Forum Discussions

  1. Rational Exponents.
    Posted in the Algebra Forum
    Replies: 3
    Last Post: February 27th 2011, 05:27 PM
  2. rational exponents..
    Posted in the Algebra Forum
    Replies: 1
    Last Post: December 15th 2010, 07:55 AM
  3. rational exponents
    Posted in the Algebra Forum
    Replies: 4
    Last Post: November 30th 2009, 08:31 AM
  4. Rational exponents
    Posted in the Algebra Forum
    Replies: 1
    Last Post: January 25th 2009, 09:08 AM
  5. Rational Exponents
    Posted in the Algebra Forum
    Replies: 5
    Last Post: September 16th 2007, 05:01 PM

Search Tags


/mathhelpforum @mathhelpforum