find an equation of the line tangent to f(x)=x^2-4x at P(3,-3)

thank you

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- Dec 15th 2008, 09:16 AMmxhockey140tangents
find an equation of the line tangent to f(x)=x^2-4x at P(3,-3)

thank you - Dec 15th 2008, 10:50 AMchabmgph
- Dec 15th 2008, 10:53 AMSkalkaz
Well, we seek a line crossing a given point. And tangent means "toucher" that means the slope tangent = local slope of the curve at the given point.

in the end we can calculate the local slope with usage of derivation.