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Let f(x) = x 2 - 2x +1 First part required to find the derivative which I found to be f '(x) = 2x - 2 I don't understand how to find the slope of

f '(x) = 2x - 2

I don't understand how to find the slope of tangent at x = 4 or how to find the equation of the tangent line using y = mx + b

I know how derivatives work and how to find them. Can you explain to me using the information how to find slope and equation?

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