Results 1 to 8 of 8

Math Help - T-89, Multiplying Binomials

  1. #1
    Newbie
    Joined
    Feb 2008
    Posts
    13

    T-89, Multiplying Binomials

    How would I get the Ti-89 to solve for (y+5)(3y-2)? When I enter this in its bare form it just spews out the question I put in.
    Follow Math Help Forum on Facebook and Google+

  2. #2
    Moo
    Moo is offline
    A Cute Angle Moo's Avatar
    Joined
    Mar 2008
    From
    P(I'm here)=1/3, P(I'm there)=t+1/3
    Posts
    5,618
    Thanks
    6
    Hello,

    Well, it depends what you want to do with that oO

    You can try to use the function develop( )

    Or if it's really an equation, you need =0 or something like that. Then, use solve(«equation»[ and «further equations»], «variable(s)»)
    Follow Math Help Forum on Facebook and Google+

  3. #3
    Newbie
    Joined
    Feb 2008
    Posts
    13
    What’s the function develop? What I want to do is get the answer laid out in the book which is 3y^2+13y-10. Like I said, this is multiplying the binomials so think of it in terms of the FOIL method.
    Follow Math Help Forum on Facebook and Google+

  4. #4
    Moo
    Moo is offline
    A Cute Angle Moo's Avatar
    Joined
    Mar 2008
    From
    P(I'm here)=1/3, P(I'm there)=t+1/3
    Posts
    5,618
    Thanks
    6
    develop means develop the expression, the contrary of factor.

    It may give you what you want...

    Check that there is no variable name y in you ti
    Follow Math Help Forum on Facebook and Google+

  5. #5
    Newbie
    Joined
    Feb 2008
    Posts
    13
    If there’s an abbreviation for function development then I’m unaware of it. It didn’t work. Nor did putting a =0 at the end of it or using “solve” work. Finally, the variables have been cleared and there hasn’t been a change in the answer it gives.
    Follow Math Help Forum on Facebook and Google+

  6. #6
    Moo
    Moo is offline
    A Cute Angle Moo's Avatar
    Joined
    Mar 2008
    From
    P(I'm here)=1/3, P(I'm there)=t+1/3
    Posts
    5,618
    Thanks
    6
    I'm sorry, it's expand() (F2 -> 3)
    Follow Math Help Forum on Facebook and Google+

  7. #7
    Newbie
    Joined
    Feb 2008
    Posts
    13
    I figured out my mistake with expand. I didn't have it in double parenthesis. Thanks for the help.
    Follow Math Help Forum on Facebook and Google+

  8. #8
    Eater of Worlds
    galactus's Avatar
    Joined
    Jul 2006
    From
    Chaneysville, PA
    Posts
    3,001
    Thanks
    1
    Here's a screen capture from my TI-92. It wroks essentially the same as the 89. If you want to solve for y, use the 'solve' function.
    Last edited by galactus; November 24th 2008 at 05:38 AM.
    Follow Math Help Forum on Facebook and Google+

Similar Math Help Forum Discussions

  1. Sum of binomials
    Posted in the Number Theory Forum
    Replies: 1
    Last Post: February 28th 2010, 10:49 PM
  2. Multiplying Binomials Quickly
    Posted in the Algebra Forum
    Replies: 4
    Last Post: May 8th 2009, 06:09 AM
  3. more binomials
    Posted in the Calculus Forum
    Replies: 3
    Last Post: October 3rd 2008, 01:32 AM
  4. binomials
    Posted in the Calculus Forum
    Replies: 4
    Last Post: October 2nd 2008, 01:25 PM
  5. binomials
    Posted in the Advanced Algebra Forum
    Replies: 1
    Last Post: August 3rd 2005, 06:58 PM

Search Tags


/mathhelpforum @mathhelpforum