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Math Help - The Root of the question?

  1. #1
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    The Root of the question?

    I am probably going to slap myself when I see the answer or how to solve this but my brain is not working...
    Any help is greatly appreciated.

    If x=3 is the root of the equation 2x+b=0, then b equals what?

    The simple side wants to say -6 but I know that is not right.
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  2. #2
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    Re: The Root of the question?

    Quote Originally Posted by lostcause117 View Post
    I am probably going to slap myself when I see the answer or how to solve this but my brain is not working...
    Any help is greatly appreciated.

    If x=3 is the root of the equation 2x+b=0, then b equals what?

    The simple side wants to say -6 but I know that is not right.
    when you say a number is the root of an expression it means that when you plug that number into the variable of the expression it evaluates to 0.

    It doesn't make sense to say 3 is a root of 2x+b=0, you would say 3 is a root of 2x+b and the =0 part is automatically assumed.

    so if 3 is a root of 2x+b,

    then 2(3)+b=0

    b=-6

    Your simple side was right this time!
    Last edited by romsek; December 18th 2013 at 06:41 PM.
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