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Math Help - Determine The domain of the function.

  1. #1
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    Thumbs up Determine The domain of the function.

    1 f(x)=-10
    2 f(x)=25
    3 f(x)=5x-10
    4 f(x)=-x+3
    5 f(x)=mx+b
    6 f(x)=-ax
    7 f(x)=25-x2 ( 2 is square on x)
    8 f(x)=x2-x (2 is square on x)
    9 f(x)=(x+4) Under root


    I didnt attend my last lecture and here ar esome question i dont know how to solve and tomorrow is last date to submit assignment please kindly solve these questions in a porper way.thanks
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  2. #2
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    Quote Originally Posted by Chief View Post
    1 f(x)=-10
    2 f(x)=25
    3 f(x)=5x-10
    4 f(x)=-x+3
    5 f(x)=mx+b
    6 f(x)=-ax
    7 f(x)=25-x2 ( 2 is square on x)
    8 f(x)=x2-x (2 is square on x)
    9 f(x)=(x+4) Under root


    I didnt attend my last lecture and here ar esome question i dont know how to solve and tomorrow is last date to submit assignment please kindly solve these questions in a porper way.thanks
    1. All your functions depend on the variable x even though x isn't "visible". But for instance
    f(x) = -10 is the same as f(x)=0\cdot x -10 and here you have your x.

    2. You have to prove for each function if there exist any constraints of x such that the term f(x) can't be calculated.
    The constraints you are supposed to know are:

    i) The denominator of a fraction must unequal zero.
    ii) The radical of a square-root must be non-negative.
    iii) The argument of a logarithm-function must be positive.

    3. There is only one function in your list whose domain isn't \mathbb{R}
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  3. #3
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    mr fantastic's Avatar
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    Quote Originally Posted by Chief View Post
    1 f(x)=-10
    2 f(x)=25
    3 f(x)=5x-10
    4 f(x)=-x+3
    5 f(x)=mx+b
    6 f(x)=-ax
    7 f(x)=25-x2 ( 2 is square on x)
    8 f(x)=x2-x (2 is square on x)
    9 f(x)=(x+4) Under root


    I didnt attend my last lecture and here ar esome question i dont know how to solve and tomorrow is last date to submit assignment please kindly solve these questions in a porper way.thanks
    Please read rule #6 here: http://www.mathhelpforum.com/math-he...ng-151418.html

    I suggest you:

    1. Attempt the rest in light of the help you were given.

    2. Get a copy of the class notes you missed from someone.

    3. Touch base with your instructor to get additional help with what you missed.

    Thread closed.
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