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Math Help - Find the function

  1. #1
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    Find the function

    Find the function of the form f(x) = Ca^x. In the graph, m = 3 and q = 27.

    m is the x-intercept and q is a point on the graph (-1, 27)

    So what is f(x)?
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  2. #2
    is up to his old tricks again! Jhevon's Avatar
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    Quote Originally Posted by n8thatsme View Post
    Find the function of the form <i>f</i> (<i>x</i>) = <i>Ca</i><i>x</i>. In the graph, m = 3 and q = 27.

    m is the x-intercept and q is a point on the graph (-1, 27)

    So what is f(x)?
    there is no need for all this weird formating. it only serves to confuse people. do you mean

    f(x) = CAx where C and A are constants?

    note that the x-intercept is the x-value when y = 0, so that

    CAm = 0 ...........................(1)

    also, (-1,27) means, when x = -1, y = 27, so that

    CA(-1) = 27 ..........................(2)

    there seems to be some info missing, because this system is inconsistent
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  3. #3
    is up to his old tricks again! Jhevon's Avatar
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    Quote Originally Posted by n8thatsme View Post
    Find the function of the form f(x) = Ca^x. In the graph, m = 3 and q = 27.

    m is the x-intercept and q is a point on the graph (-1, 27)

    So what is f(x)?
    ok, that's better.

    note that you have

    f(3) = 0

    and

    f(-1) = 27

    thus you have a pair of simultaneous equations with two unknowns. you can solve for a and c
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  4. #4
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    I edited the formatting a little bit. I have a graph but I don't know how to show it on here. The graph is the reflection of a^x. But what I gave is my entire problem.
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