If f (x) = √2 + 5x, find f'(5), using the definition of derivative. f'(5) is the limit as ï → As long as x " y = of the difference quotient this expression simplifies to The value of this limit is f'(5) = Use this to find the equation of the normal line to the function f(x) = √2 + 5x at the point The equation of this normal line can be written in the form

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