Explanation: We know the tangent line is horizontal when y' = 0. So we want to find all points on the curve where y' = 0. STEP 1: Use implicit differentiation to find y' 2x +(1 ⋅ y +xy')

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You'll get a detailed solution from a subject matter expert that helps you learn core concepts. See Answer Show transcribed image text Expert Answer Given:- f (x)=x3−4x2−8x+15 Solution:- We

Transcribed image text: Find all the values of x where the tangent line is horizontal. Next Question f (x) = 2x® + 39x2 + 252x + 15 X= (Use a comma to separate answers as needed.