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Date May 2021 Marks available 7 Reference code 21M.1.AHL.TZ1.17
Level Additional Higher Level Paper Paper 1 Time zone Time zone 1
Command term Find Question number 17 Adapted from N/A

Question

The graph of the function f(x)=lnx is translated by ab so that it then passes through the points (0, 1) and (e3, 1+ln2) .

Find the value of a and the value of b.

Markscheme

new function is fx-a+b=lnx-a+b            (M1)

f0=ln-a+b=1           A1

fe3=lne3-a+b=1+ln2           A1

ln-a=lne3-a-ln2            (M1)

ln-a=lne3-a2

-a=e3-a2

-2a=e3-a

a=-e3  =-20.0855           A1

b=1-lne3=1-3=-2            (M1)A1

 

[7 marks]

Examiners report

[N/A]

Syllabus sections

Topic 2—Functions » AHL 2.8—Transformations of graphs, composite transformations
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