Results 1 to 2 of 2

Math Help - Cubics equations

  1. #1
    Junior Member
    Joined
    Dec 2007
    Posts
    41

    Cubics equations

    The equation x^3 + 5x - 10 has only one solution. This solution lies between either

    a) -2 and -1
    b) -1 and 0
    c) 0 and 1
    d) 1 and 2
    e) 2 and 8

    The polynomial P(x)= x^4 +ax^2 - 4 has zeros at x = 1 and x = -3. The values of a and b are

    a) 0
    b) 2
    c) -2
    d) -3
    e) 3


    Thanks in advance!!
    Follow Math Help Forum on Facebook and Google+

  2. #2
    Flow Master
    mr fantastic's Avatar
    Joined
    Dec 2007
    From
    Zeitgeist
    Posts
    16,948
    Thanks
    5
    Quote Originally Posted by delicate_tears View Post
    The equation x^3 + 5x - 10 has only one solution. This solution lies between either

    a) -2 and -1
    b) -1 and 0
    c) 0 and 1
    d) 1 and 2
    e) 2 and 8

    Mr F says: Apply the Intermediate Value Theorem: Properties of Continuous Functions

    The polynomial P(x)= x^4 +ax^2 - 4 has zeros at x = 1 and x = -3. The values of a and b are

    a) 0
    b) 2
    c) -2
    d) -3
    e) 3

    Mr F says:
    1. There's no b in this question ...... ??
    2. As written, none of the options are correct since P(1) = 0 and P(-2) = 0 give different values of a.


    Thanks in advance!!
    ..
    Follow Math Help Forum on Facebook and Google+

Similar Math Help Forum Discussions

  1. Cubics!
    Posted in the Algebra Forum
    Replies: 2
    Last Post: March 12th 2010, 01:16 PM
  2. Cubics
    Posted in the Algebra Forum
    Replies: 2
    Last Post: March 12th 2010, 01:16 PM
  3. cubics
    Posted in the Algebra Forum
    Replies: 2
    Last Post: January 9th 2009, 04:45 AM
  4. Cubics
    Posted in the Number Theory Forum
    Replies: 1
    Last Post: October 5th 2008, 03:59 PM
  5. Cubics fun
    Posted in the Algebra Forum
    Replies: 4
    Last Post: April 13th 2008, 06:50 AM

Search Tags


/mathhelpforum @mathhelpforum