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Differentiating functions: Find the error


Wang Fang tried to find the derivative of x53x+9. Here is her work:
Step 1: This is the quotient of x5 and 3x+9. So we should use the quotient rule.
Step 2:
Step 3: Finding the derivatives of the factors:
Step 4: Putting it all together:
Is Wang Fang's work correct? If not, what's her mistake?
Choose 1 answer: