If you are a little weak in using the derivative to find the equation of the tangent line, here is a step by step summary. Do not try to speed read these instructions.
https://mrsiderer.wordpress.com/2015/10/22/tangent-line-problem/
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About mrsiderer
I am am a mechanical engineer and a math and physics teacher. I like to understand the way things work, to know about new things that are being developed, and to understand how math impacts everything. I value my time and yours and will only post quality material.