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Show that the function $f$ increases.
Mathematics 9709 · AS & A Level · Differentiation
Differentiation — practice question
It is stated that $f(x) = (2x - 5)^3 + x$, for $x \in \mathbb{R}$.
Worked solution & mark scheme
This 3-mark question has a full step-by-step worked solution and mark scheme. One marking point: “Differentiate to get $f'(x)=2(2x-5)^2+2$ or $f'(x)=24\left(x-\frac{5}{2}\right)^2+1$” …
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