ICSE Class X Math 2015 Solved Paper | Question 46

ICSE Class X Math 2015 Solved Paper

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Question : 46

Total: 52

If A[

3	7
2	4

],B=[

0	2
5	3

] and C=[

1	−5
−4	6

]
Find AB−5C .

Solution:

‌ Given : ‌ A‌=[

3	7
2	4

],B=[

0	2
5	3

],C =[

1	−5
−4	6

]
AB‌=[

3	7
2	4

][

0	2
5	3

]
‌=[

0+35	6+21
0+20	4+12

]=[

35	27
20	16

]
5C‌=5[

1	−5
−4	6

]
‌=[

5	−25
−20	30

]
AB−5C‌=[

35	27
20	16

]−[

5	−25
−20	30

]
=[

30	52
40	−14

]

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