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Math Help - Algebra

  1. #1
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    Algebra

    A curve has the equation y=(ax+3)Inx , where x>0 and a is a positive constant.The normal to the curve at the point where the curve crosses the x-axis is parallel to the line 5y+ x = 2.Find the value of a.
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  2. #2
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    Red face Re: Algebra

    is a=2??? I considered the case where a is a positive integer. The graph will cut x-axis at x=1(lnx=0).So i found the "slope" of normal at x=1 in terms of a and equate it with -1/5.Slope of normal came out to be (a+3).
    Edit:I guess this question should come under pre-univesity calculus
    Edit:My method is correct but answer could be wrong.
    Last edited by smatik; August 2nd 2013 at 09:28 PM.
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