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Question

If A=3x-12x+3x+2 is a symmetric matrix, then the value of x is


A

4

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B

3

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C

-4

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D

-3

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Solution

The correct option is C

-4


Explanation for the correct option:

Given, A=3x-12x+3x+2 is a symmetric matrix

AT=A

32x+3x-1x+2=3x-12x+3x+2

Both the matrices are equal, Compare the corresponding elements:

2x+3=x-1

x=-4

Hence, Option ‘C’ is Correct.


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