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CBSE Class 12 Math 2012 Solved Paper

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Question : 3
Total: 29
If (
23
57
)(
1−3
−24
) = (
−46
−9x
) , write the value of x.
Solution:  
(
23
57
)(
1−3
−24
) = (
−46
−913
)
⇒ (
−46
−9x
) = (
−46
−9x
)
by equality of matrices
x = 13
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