Zadanie 4c
Use a graph or another method to find (i) the least material area; (ii) the corresponding radius.
Find and justify extrema or inflections, distinguish necessary from sufficient conditions, and optimize within a stated domain.
Tę umiejętność sprawdza 49 zadań wzorowanych na arkuszach IB z lat 2022–2026.
Use a graph or another method to find (i) the least material area; (ii) the corresponding radius.
Find A and B.
(i) Write a volume equation for the cuboid using x and y. (ii) Show that A = 4x3 + 1728/x + 864/x2.
(i) Find the minimum surface area A. (ii) Find the second derivative of A at x=k. (iii) Use it to justify that this stationary value is a minimum.
The graph has horizontal tangents at x=3 and at a distinct x=k. (i) Show that c=9. (ii) Find k. (iii) Classify the stationary point at x=k, with justification.
The required force is 240 N both for a horizontal pull and when θ = π/3. The force is least when θ=α, with 0 < α < π/2. (i) Show that . (ii) Hence show…
(i) Find A′(θ). (ii) Hence find the maximum opening area.
The curve y = h(x) is defined for real x by . Its local minimum is M(a, b), with a > 1. Find a and b.
Find its maximum speed over this interval.
Hence determine the x-coordinate of the point on the curve nearest to A.
Let x = k be stationary for T. (i) Find k. (ii) Hence find T at x=k. (iii) Find y at x=k.
Let x = k be the stationary argument of T. (i) Find d2T/dx2. (ii) Hence justify whether T has a local minimum or a local maximum at x=k.
(i) Find h′(t). (ii) Hence or otherwise, find when the marker’s height decreases most rapidly during one turn.
(i) Find k. (ii) Hence give the coordinates of P.
Find P when d is as small as possible.
Find a and b.
Classify the stationary point at x=a, giving a reason.
Is x=c an inflection point of the profile? Explain.
Find when the growth rate predicted by G is largest.
For V=96 cm³ and positive r,h, find the minimum S and its corresponding r.
Hence show that .
Find the maximum velocity on the given time interval.
Find the coordinates of A and use y″ to justify your choice.
Find the x-coordinate of B.
(i) State where f′(x) = 0. (ii) Show that f′′(x) = (−8x2 + 32x − 20)/(2x2 − 8x + 11)2. (iii) Hence justify that the stationary point is a local minimum.
Show that the annual harvest H, in kilograms, is H = 48x − 7πx2.
(i) Find dH/dx. (ii) Find x maximizing the harvest and justify the maximum. (iii) Find the corresponding h.
Determine the calendar year in which the two predictions differ most over 20≤t≤70.
Over 20≤t≤70, determine the calendar year in which the two capacity predictions differ most.
Show that .
The maximizing radius can be written , where p is a positive integer. Find p.
Find the maximum volume in the form , where q is a positive integer.
Show that .
The maximizing radius can be written , where p is a positive integer. Find p.
Find the maximum volume in the form , where q is a positive integer.
Hence find A.
Hence find the greatest speed before the first rest time.
Find the greatest speed over 0≤t≤5.
Find the y-coordinate of R when the triangle area is greatest.
Show that S(x) = 108/x + 3πx2.
Use S(x) = 108/x + 3πx2. (i) Find S′(x). (ii) Find the exact positive stationary radius a.
For S(x) = 108/x + 3πx2 and a = (18/π)1/3: (i) find S″(x); (ii) use S″ to justify a minimum at a; (iii) find the minimum area.
Show that S(x) = 108/x + 3πx2.
Use S(x) = 108/x + 3πx2. (i) Find S′(x). (ii) Find the exact positive stationary radius a.
For S(x) = 108/x + 3πx2 and a = (18/π)1/3: (i) find S″(x); (ii) use S″ to justify a minimum at a; (iii) find the minimum area.
(i) State the x-coordinate of the inflection point of f. (ii) Find where f is concave down, justifying your answer.
An open-top rectangular container has internal dimensions 3x by x by y centimetres, with x,y>0. Its volume is 71.6 cm³. Ignore wall thickness. Find the minimum material area needed for its base and four sides.
Find the coordinates of A.
(i) Find f′(x). (ii) Hence find all points on the graph where f′(x) = 0, including the endpoints when appropriate.
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