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Date May 2022 Marks available 5 Reference code 22M.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

The derivative of a function g is given by g'x=3x2+5ex, where x. The graph of g passes through the point (0, 4) . Find g(x).

Markscheme

METHOD 1

recognises that gx=3x2+5exdx           (M1)

gx=x3+5ex+C           (A1)(A1)


Note: Award A1 for each integrated term.

 

substitutes x=0 and y=4 into their integrated function (must involve +C)           (M1)

4=0+5+CC=-1

gx=x3+5ex-1           A1

 

METHOD 2

attempts to write both sides in the form of a definite integral           (M1)

0xg'tdt=0x3t2+5etdt           (A1)

gx-4=x3+5ex-5e0           (A1)(A1)


Note:
Award A1 for gx-4 and A1 for x3+5ex-5e0.


gx=x3+5ex-1           A1

 

[5 marks]

Examiners report

While many students were successful in solving this question, some did not consider the constant of integration or struggled to integrate the exponential term. A few students lost the final mark for stopping at C=-1 and not giving the formula for g(x).

Syllabus sections

Topic 5 —Calculus » SL 5.5—Integration introduction, areas between curve and x axis
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Topic 5 —Calculus

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