Question: Please show me how to solve these 9. (12 pts) Determine all x-values, if any exist, where the following function has a horizontal tangent line.
Please show me how to solve these

9. (12 pts) Determine all x-values, if any exist, where the following function has a horizontal tangent line. f(z) = (12 - 4. -5)4 10. (14 pts) Find the equation of the tangent line to the curve given by the following equation at the point (1, 0). 10 -+ 3xy + siny = 10
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