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Math Help - Factor

  1. #1
    Junior Member Jarod_C's Avatar
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    Factor

    Hi all, here's the deal I need help on a quiz question. The teacher said I can't get help with this. So Please don't tell me how to solve this just in case she sees this thread.(She's a stocker j/k) So, can someone just tell me if the awswer is right, or if I need to work on it.

    x^3-3x^2-54x That's the question I need to factor.

    Here's my awswer, x(x+6)(x-9) Is my awswer right or wrong?
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  2. #2
    MHF Contributor Mathstud28's Avatar
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    Quote Originally Posted by Jarod_C View Post
    Hi all, here's the deal I need help on a quiz question. The teacher said I can't get help with this. So Please don't tell me how to solve this just in case she sees this thread.(She's a stocker j/k) So, can someone just tell me if the awswer is right, or if I need to work on it.

    x^3-3x^2-54x That's the question I need to factor.

    Here's my awswer, x(x+6)(x-9) Is my awswer right or wrong?
    We will not answer quiz questions...or even help usually...the ONLY thing I will give you is this if f(x)=g(x) then f(c)=g(c)
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  3. #3
    Moo
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    A Cute Angle Moo's Avatar
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    Hello,

    If you're not sure, develop to see if you get the same result
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  4. #4
    Super Member
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    Quote Originally Posted by Jarod_C View Post
    Hi all, here's the deal I need help on a quiz question. The teacher said I can't get help with this. So Please don't tell me how to solve this just in case she sees this thread.(She's a stocker j/k) So, can someone just tell me if the awswer is right, or if I need to work on it.

    x^3-3x^2-54x That's the question I need to factor.

    Here's my awswer, x(x+6)(x-9) Is my awswer right or wrong?

    You should be aware of methods that you can use to check your own solution.

    Firstly, you need to understand that an un-factored expression is identical to a factored expression. the easier way to check would be test both expressions with the same value and see if you get the same result

    for example

    is 1^3-3(1^2)-54(1) the same as 1(1+6)(1-9) ?

    this method however only gives you an indication as to whether your answer is correct or not, it does not necessarily confirm that you answer it correct, do you understand why ?

    for this question though you best bet is to expand x(x+6)(x-9) and see if your back to where you started.

    so Jarod_C are you right or wrong ?

    Bobak
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