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September 22, 2014

September 22, 2014

Posted by **JULIA** on Tuesday, June 5, 2012 at 6:21pm.

The lesson is not very clear on what a tangent line approximaton is.

- Derivatives? -
**drwls**, Wednesday, June 6, 2012 at 3:06amThe tangent line approximation is:

f(x) = f(a) + (x-a)*f'(a)

It is the formula for a straight line that goes through x = a with the slope of f(x) at x=a.

Let a = -0.5 and x = 0

f(0) = 2 + (0.5)*4 = 4

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