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Math Help - New TI nspire CAS

  1. #1
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    New TI nspire CAS

    Hello,

    I was wondering if someone could help me with a problem I am having with my nspire cas calculator. When I try to factor a perfect square trinomial like factor(4x^2 -36xy + 81y^2) it returns the following answer 4x^2+9(9y^2-4xy) instead of (2x-9y)^2, which is what the book that I am reading says it should be. I don't think that it is a calculator issue. I am more inclined to believe the problem is with me.

    Thanx,

    Jim
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  2. #2
    Rhymes with Orange Chris L T521's Avatar
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    Quote Originally Posted by bitnibbler View Post
    Hello,

    I was wondering if someone could help me with a problem I am having with my nspire cas calculator. When I try to factor a perfect square trinomial like factor(4x^2 -36xy + 81y^2) it returns the following answer 4x^2+9(9y^2-4xy) instead of (2x-9y)^2, which is what the book that I am reading says it should be. I don't think that it is a calculator issue. I am more inclined to believe the problem is with me.

    Thanx,

    Jim
    The TI 89 will do the same thing if you input that expression into it.

    The issue is this: its treating xy as a variable, instead of the product of two variables.

    To fix that, type in (4x^2-36x*y+81y^2) and it should give you the desired result.
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  3. #3
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    Thank you for posting a response. If I read your suggestion correctly, it was to place a multiplication symbol between the x and y of the second term. I gave it a go and it did the same thing. I did notice that the nspire always expands the equation out inserting multiplication symbols where it thinks they should go. I appreciate the help though.

    Jim
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  4. #4
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    What I find odd is that it works on the CAS software running on my vista box but not the calc.
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