Mark M. answered 05/06/20
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Retired math prof. Calc 1, 2 and AP Calculus tutoring experience.
f(x) + x2[f(x)]3 = 10
Using the Product Rule and Chain Rule, we have: f'(x) + 2x[f(x)]3 + x2(3[f(x)]2f'(x)) = 0
So, when x = 1, we get f'(1) + 16 + 12f'(1) = 0
13f'(1) = -16
f'(1) = -16/13