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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, #35 · Calculus · Derivatives

From which point … does the tangent line to … hit the…

From which point $x = a$ does the tangent line to $y = 1/ x^{2}$ hit the $x$ axis at $x = 3$ ?

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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, #35

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Checked against the answer in Gilbert Strang, Calculus, 3rd edition (Wellesley-Cambridge Press; MIT OpenCourseWare RES.18-001).