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Math Help - Functions problem

  1. #1
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    Functions problem

    Problem: The graph below shows the function g, where g(x) = k(x+3)(x-3) for some constant k. If g(a-1.2)=0 and a>0, what is the value of a?

    Last edited by CaptainBlack; May 31st 2011 at 12:21 AM.
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  2. #2
    Rhymes with Orange Chris L T521's Avatar
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    Quote Originally Posted by yety124 View Post
    Graph: http://i55.tinypic.com/amtdsy.jpg

    Problem: The graph above shows the function g, where g(x) = k(x+3)(x-3) for some constant k. If g(a-1.2)=0 and a>0, what is the value of a?
    If you plug a-1.2 in for x, you get g(a-1.2) = k((a-1.2)+3)((a-1.2)-3) = k(a+1.8)(a-4.2)=0. So either a+1.8=0 or a-4.2=0; however, a>0...so which answer will it be?
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