Results 1 to 6 of 6

Math Help - Negative Exponent

  1. #1
    Newbie
    Joined
    Dec 2008
    Posts
    2

    Red face Negative Exponent

    I feel really stupid for not remembering this... I don't remember how to deal with negative exponents.

    What would I have to do with this to get rid of the negative exponent? -2x^3
    Follow Math Help Forum on Facebook and Google+

  2. #2
    Member
    Joined
    Oct 2008
    From
    Singapore
    Posts
    160
    Do you mean 2x^-3 then it is equivalent to 1/2x^3

    Quote Originally Posted by evenstar7139 View Post
    I feel really stupid for not remembering this... I don't remember how to deal with negative exponents.

    What would I have to do with this to get rid of the negative exponent? -2x^3
    Follow Math Help Forum on Facebook and Google+

  3. #3
    Newbie
    Joined
    Dec 2008
    Posts
    6
    Quote Originally Posted by evenstar7139 View Post
    I feel really stupid for not remembering this... I don't remember how to deal with negative exponents.

    What would I have to do with this to get rid of the negative exponent? -2x^3
    if you mean: (2x^-3) then:
    simple rules:


    x^2 = x.x
    x^-2 = (1/x)^2

    a minus sign before your exponent just means you need to write 1/ (by whatever you need to calculate)


    ex:
    x^-3 = (1/x)^3
    25^-2 = (1/25)
    4^(-1/2) = (1/4)^(1/2) = square root out of 1/4
    ...


    if you mean (-2x)^3 then its simply (-1)^3 . (2x)^3 = ...
    Follow Math Help Forum on Facebook and Google+

  4. #4
    MHF Contributor

    Joined
    Apr 2005
    Posts
    15,393
    Thanks
    1327
    Quote Originally Posted by evenstar7139 View Post
    I feel really stupid for not remembering this... I don't remember how to deal with negative exponents.

    What would I have to do with this to get rid of the negative exponent? -2x^3
    -2x^3 does NOT have a negative exponent to get rid of. (-2x)^3 also does not have a negative exponent but can be written -8x^3.
    Follow Math Help Forum on Facebook and Google+

  5. #5
    Newbie
    Joined
    Dec 2008
    From
    Wellington ,FL
    Posts
    19

    Exclamation

    Usually when there is a negative exponent ,you just flip the equation:
    example 5 to negative one power = one fifth
    the power becomes positive.
    Follow Math Help Forum on Facebook and Google+

  6. #6
    MHF Contributor

    Joined
    Apr 2005
    Posts
    15,393
    Thanks
    1327
    Quote Originally Posted by tester85 View Post
    Do you mean 2x^-3 then it is equivalent to 1/2x^3
    Actually, it's not. 2x^-3 is equivalent to 2/x^3. If it were (2x)^-3, then it would be equivalent to 1/(2x^3).
    Follow Math Help Forum on Facebook and Google+

Similar Math Help Forum Discussions

  1. Replies: 3
    Last Post: April 27th 2011, 04:53 PM
  2. Negative fraction with exponent?
    Posted in the Algebra Forum
    Replies: 4
    Last Post: January 28th 2011, 07:54 PM
  3. Replies: 2
    Last Post: November 4th 2009, 12:32 PM
  4. negative exponent
    Posted in the Pre-Calculus Forum
    Replies: 1
    Last Post: April 16th 2009, 08:23 PM
  5. Replies: 1
    Last Post: August 19th 2008, 08:41 AM

Search Tags


/mathhelpforum @mathhelpforum