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Suppose you absolutely needed to know the value of the square root of 19 but all you had was pencil and paper, no calculator. Could you calculate it? With your current understanding of the derivative as the slope of a tangent line, you should be able to. Try computing √19 without a calculator; then compare your result with this concept's method of linearization and a calculator.
This informational material will explain how to create a linear representation of non-linear data, using technology and by-hand calculations. There is a corresponding video available. Practice questions with a PDF answer key are provided.