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3-77.

This is Ana's Definition of the Derivative:

Observe that x3 + x = 30 when x = 3.

f(x) = x3 + 3

a = 3
Notice that f(3) = 3³ + 3 = 30, which confirms that equation of f(x) is correct.

f(x) = x³ + x
f '(x) =_______________________
f '(3) =__________
You just avoided a lot of Algebra!