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# C3 help please!!! :( watch

1. 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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2. Find the value of 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 where m is the value of the gradient of the normal.
3. 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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Updated: January 18, 2015
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