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I need help with the following question.

Find the largest positive value of x at which the curve:

$$y = (2x + 7)^6 (x - 2)^5$$

has a horizontal tangent line.

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    Hint: Horizontal tangent line - is $\frac{dy}{dx} 0, $ or positive or negative?2012-03-19
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    A sketch often helps - easy to do here by first sketching the sextic and quintic factors.2012-03-19
  • 0
    How do I proceed after finding the derivative of y?2012-03-19

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