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Date May Example question Marks available 3 Reference code EXM.1.AHL.TZ0.11
Level Additional Higher Level Paper Paper 1 Time zone Time zone 0
Command term Find Question number 11 Adapted from N/A

Question

Let A ( 1 2 3 1 ) and B = ( 3 0 2 1 ) .

Find A + B.

[2]
a.

Find −3A

[2]
b.

Find AB.

[3]
c.

Markscheme

* This question is from an exam for a previous syllabus, and may contain minor differences in marking or structure.

evidence of addition     (M1)

eg at least two correct elements

A + B =  ( 4 2 1 0 )     A1    N2

[2 marks]

a.

evidence of multiplication    (M1)

eg at least two correct elements

−3A = ( 3 6 9 3 )     A1    N2

[2 marks]

b.

evidence of matrix multiplication (in correct order)   (M1)

eg  AB =  ( 1 ( 3 ) + 2 ( 2 ) 1 ( 0 ) + 2 ( 1 ) 3 ( 3 ) + ( 1 ) ( 2 ) 3 ( 0 ) + ( 1 ) ( 1 ) )

AB = ( 1 2 11 1 )        A2  N3

[3 marks]

c.

Examiners report

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

Syllabus sections

Topic 1—Number and algebra » AHL 1.14—Introduction to matrices
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Topic 1—Number and algebra

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