Calculus Problem: Optimization Rowing a boat and walking - Minimize time

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Solve an optimization problem that involves rowing across a lake and walking along the shore to minimize the time it takes to arrive at a point.
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Thanks for the video! This was very helpful

thebomdotcom
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Hello in the video timeline 7:36/11:08 when you differentiated (12-x)/4 after using the quotient rule to differentiate, you should not get 1/4, what happened to the x in that expression?, you should get -(12-x)/4

louisadibe