Find the r-coordinate of all points on the graph of f(r) = r³-2r² - 4r +3 t which the tangent line is horizontal. 1. r-coord=-2 2. r-coord= 3. r-coords= 4. r-coords = 6. x-coord 213 5. a-coord= 2 11 2 3' 213 I 3 2 735 2

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