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ICSE Class X Math 2016 Solved Paper

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Given A=[
4sin‌30∘cos‌0∘
cos‌0∘4sin‌30∘
] and B=[
4
5
] If AX=B
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Question : 27
Total: 57
Write the order of matrix X.
Solution:  
‌‌ Given : ‌A=[
4sin‌30∘cos‌0∘
cos‌0∘4sin‌30∘
] ‌‌ and ‌B=[
4
5
]
Order of A=2×2 , Order of B=2×1
Also given: ‌‌AX=B
[]2×2[]2×1=[]2×1
∴‌‌ Order of X=2×1‌‌
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