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    • Thread Starter

    Has anyone got any idea how to do question 4 onwards?? I can differentiate but I just don't know how to find the gradient/equation etc

    Thank you!!

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    • Very Important Poster

    Very Important Poster
    Find the value of \frac{dy}{dx} and think about the relationship between the value of gradient of the tangent at that point and the gradient of the normal at that point, then use (y-y_1)=m(x-x_1) where m is the value of the gradient of the normal.

    For question 4, use product rule to find f'(x), then substitute in x=1 to find gradient at tangent. To find the gradient of the normal, it is (-1/gradient at tangent).

    Then use the equation y - y1 = m(x - x1) to find an equation for the normal.
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