You are given the derivative f’(x) = - + 4,
and they want you find ant--derivative.
According to the rules of finding anti-derivatives,
f(x) = + + 4x + C,
where "C" is a constant.
Solved.
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For rules taking anti-derivatives, see your Calculus textbook, or your friend's Calculus textbook,
or any other Calculus textbook.
Or million Internet sites, for example, these four sites
A good Calculus student MUST know these rules as good and as confidently,
as he (or she) knows the multiplication table within the first ten natural numbers.