Derivatives?

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Given that f(-0.5)=2 and f'(-0.5)=4, use a tangent line approximation to estimate f(0).
The lesson is not very clear on what a tangent line approximaton is.

  • Derivatives? -

    The 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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