Zadanie 3
A differentiable function has derivative f′(x) = 2x2 + x − 4 for all real x. Find where f is decreasing.
Use the sign of a derivative to identify intervals of increase or decrease and interpret stationary locations.
Tę umiejętność sprawdza 6 zadań wzorowanych na arkuszach IB z lat 2022–2026.
A differentiable function has derivative f′(x) = 2x2 + x − 4 for all real x. Find where f is decreasing.
Find the x-values for which h is increasing.
Find the intervals on which f is decreasing.
Hence explain why f has no interval on which it is increasing.
(i) Show that 2x2 − 8x + 11 > 0 for every real x. (ii) Hence determine where f is increasing.
Find d for which g has a strictly positive derivative at every real x.
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