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Gilbert Strang, Calculus, 3rd edition (Wellesley-Cambridge Press; MIT OpenCourseWare RES.18-001) §2.3 The Slope and the Tangent Line, #7 · Calculus · Derivatives

For … the secant line from … to … has the equation…

For $y = x^{2}$ the secant line from $(a, a^{2})$ to $(c, c^{2})$ has the equation \_\_\_\_\_\_. Do the division by $c - a$ to find the tangent line as $c$ approaches $a$ .

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Gilbert Strang, Calculus, 3rd edition (Wellesley-Cambridge Press; MIT OpenCourseWare RES.18-001) · §2.3 The Slope and the Tangent Line, #7

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