1 Calculate the difference quotient for f(x) = at a = 4. V2x + 9 (Express numbers in exact form. Use symbolic notation and fractions where needed.) f(4 + h) – f(4) h Calculate f' (4) by finding the following limit. f(4 + h) – f(4) lim h-0 (Give an exact answer. Use symbolic notation and fractions where needed.) f' (4) = Find an equation of the tangent line to f(x) at a = 4. (Express numbers in exact form. Use symbolic notation and fractions where needed.) y =

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