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Thread: Determining Values for A, B, and C in Quadratic Formula

  1. #1

    Determining Values for A, B, and C in Quadratic Formula

    I have a question:

    For the quadratic equation (2x+1)(x+3)=0, does 2=a, 1=b, and 3=c?
    Last edited by mmm4444bot; 07-20-2012 at 08:04 PM. Reason: Title typo, title typo, title typo

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    Determining Values for A,B, and C in Quadratic Formula

    Quote Originally Posted by TiaharaJBennett View Post
    I have a question:

    For the quadratic equation (2x+1)(x+3)=0, does 2=a, 1=b, and 3=c?
    FIRST, please start a new thread for each new probelem you have.

    No. The standard form of a quadratic equation is y = ax^2 + bx + c so you will first need to multiply (2x+1)(x+3) out and get it into standard form. Then you can see what a, b and c are.
    Last edited by srmichael; 07-20-2012 at 03:36 PM.
    "There are 10 types of people in this world - those who understand binary and those who don't."

  3. #3
    Quote Originally Posted by srmichael View Post
    FIRST, please start a new thread for each new probelem you have.

    you will first need to multiple (2x+1)(x+3) out and get it into standard form. Then you can see what a, b and c are.
    You mean multiply?

  4. #4
    Elite Member mmm4444bot's Avatar
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    Of course he means multiply! Have you not learned FOIL yet?!

    PS: I split your previous thread. Note the useful subject line.

  5. #5
    Quote Originally Posted by mmm4444bot View Post
    Of course he means multiply! Have you not learned FOIL yet?!

    PS: I split your previous thread. Note the useful subject line.
    Yes, I know about FOIL. But I haven't used it since I was in 9th grade. I'll figure it out though.
    Last edited by TiaharaJBennett; 07-20-2012 at 03:46 PM.

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    Elite Member mmm4444bot's Avatar
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    What grade are you in now?

  7. #7
    Quote Originally Posted by mmm4444bot View Post
    What grade are you in now?
    I'm a junior.

  8. #8
    Okay, I did the FOIL method, and got:
    2x2+7x+3

    2=a,7=b, and 3=c

    Right? Please say yes.

  9. #9
    Elite Member mmm4444bot's Avatar
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    Yes.

    Are you thinking that you need to use the Quadratic Formula to solve the equation (2x+1)(x+3) = 0 ?

    If so, I would like you to know that there is a much simpler method that uses something called the Zero-Product Property.

  10. #10
    Quote Originally Posted by mmm4444bot View Post
    Yes.

    Are you thinking that you need to use the Quadratic Formula to solve the equation (2x+1)(x+3) = 0 ?

    If so, I would like you to know that there is a much simpler method that uses something called the Zero-Product Property.
    I've never learned that. How does it work? But yeah, I was going to just use the quadratic formula.
    Last edited by TiaharaJBennett; 07-20-2012 at 04:36 PM.

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