Examples: Taking Second Derivatives with the Chain Rule

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In this video, we look at examples where we have to take first AND second derivatives while using the chain rule.

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around 8:30 you factored out the 3x+5 so wouldnt there just be one 3x+5 left. I dont think it would be squared? I thought y'=(3x+5)(12x+5). Also, the 9x was being multiplied to 3x+5 so how did it add with the 3x to make 12x?

aaliyal