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Date May 2021 Marks available 2 Reference code 21M.2.SL.TZ2.2
Level Standard Level Paper Paper 2 Time zone Time zone 2
Command term Find Question number 2 Adapted from N/A

Question

Let fx=3x-40.15x2 for 0x3.

Sketch the graph of f on the grid below.

[3]
a.

Find the value of x for which f(x)=0.

[2]
b.

Markscheme

         A1A1A1

 

Note: Award A1 for a smooth concave down curve with generally correct shape. If first mark is awarded, award A1 for local maximum and x-intercept in approximately correct position, award A1 for endpoints at x=0 and x=3 with approximately correct y-coordinates.

 

[3 marks]

a.

recognizing that f(x)=0 at local maximum                 (M1)

x=2.33084

x=2.33                           A1

 

[2 marks]

b.

Examiners report

[N/A]
a.
[N/A]
b.

Syllabus sections

Topic 2—Functions » SL 2.4—Key features of graphs, intersections using technology
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Topic 2—Functions

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