Date | May 2021 | Marks available | 5 | Reference code | 21M.2.AHL.TZ1.11 |
Level | Additional Higher Level | Paper | Paper 2 | Time zone | Time zone 1 |
Command term | Sketch and Show | Question number | 11 | Adapted from | N/A |
Question
The function is defined by , for , , .
The graph of has exactly one point of inflexion.
The function is defined by , for .
Find the value of and the value of .
Find an expression for .
Find the -coordinate of the point of inflexion.
Sketch the graph of for , showing the values of any axes intercepts, the coordinates of any local maxima and local minima, and giving the equations of any asymptotes.
Find the equations of all the asymptotes on the graph of .
By considering the graph of , or otherwise, solve for .
Markscheme
attempt to solve e.g. by factorising (M1)
or vice versa A1
[2 marks]
attempt to use quotient rule or product rule (M1)
EITHER
A1A1
Note: Award A1 for each term in the numerator with correct signs, provided correct denominator is seen.
OR
A1A1
Note: Award A1 for each term.
[3 marks]
attempt to find the local min point on OR solve (M1)
A1
[2 marks]
A1A1A1A1A1
Note: Award A1 for both vertical asymptotes with their equations, award A1 for horizontal asymptote with equation, award A1 for each correct branch including asymptotic behaviour, coordinates of minimum and maximum points (may be seen next to the graph) and values of axes intercepts.
If vertical asymptotes are absent (or not vertical) and the branches overlap as a consequence, award maximum A0A1A0A1A1.
[5 marks]
A1
(oblique asymptote has) gradient (A1)
appropriate method to find complete equation of oblique asymptote M1
A1
Note: Do not award the final A1 if the answer is not given as an equation.
[4 marks]
attempting to find at least one critical value (M1)
OR OR A1A1A1
Note: Only penalize once for use of rather than .
[4 marks]